Cat Health Checklist: How to Spot Illness, Perform Home Checks, and Prevent Common Diseases

Cats are skilled at hiding signs of illness, which makes early detection essential for their long-term health. By performing regular at-home checks, you can identify subtle changes before they develop into serious problems. Simple observations of your cat’s eyes, ears, weight, and behaviour can help you stay ahead of potential issues. ASL Vets supports cat owners with expert, affordable care, ensuring your feline friend receives the right attention at every life stage, from kittenhood to senior years. Regular monitoring combined with professional check-ups is the best way to keep your cat happy, healthy, and thriving.

Cats are experts at masking illness, so it’s important to understand the visible and behavioural signs of feline wellness. By recognising what is normal, cat owners can spot subtle changes early.

Behavioural Signs

• Playful and active: Healthy cats show curiosity, enjoy play, and interact confidently with their environment.
• Normal appetite: A well cat eats consistently and with enthusiasm. Sudden loss or increase in appetite may signal digestive or dental issues.
• Regular urination and bowel movements: Normal litter tray habits include daily urination and stool that is firm and brown. Straining, diarrhoea or changes in frequency are red flags.
• Good grooming habits: Self-grooming is a natural cat behaviour. A healthy cat keeps their coat smooth and clean. Lack of grooming may signal pain, stress, or obesity.
• Comfortable and relaxed: A content cat rests peacefully, stretches fully, and doesn’t hide. Fear, anxiety, or pain often cause withdrawal or defensive behaviour.
• Consistent sleep-wake patterns: Cats sleep frequently but should follow a pattern. Disrupted sleep or increased restlessness may suggest underlying discomfort.
• Stable behaviour: No sudden aggression, excessive clinginess or hiding. Changes in mood or interaction patterns can be early indicators of illness or cognitive decline.

Physical Signs

• Bright and clear eyes: Eyes should be alert, free from redness, discharge, cloudiness, or excessive tearing.
• Shiny and smooth coat: A healthy coat lies flat, reflects light, and lacks flakes, bald spots, or mats. Dull fur may suggest nutritional deficits or illness.
• Healthy gums: Gums should be firm, moist, and salmon pink. Redness, swelling, or bleeding can indicate gingivitis or infection.
• Clean ears: Ears are free from odour, wax buildup, discharge, or excessive scratching. Discomfort may indicate mites or infections.
• Normal body condition: You should feel the ribs but not see them. There should be a visible waist when viewed from above and a slight abdominal tuck from the side.
• Steady breathing: Breathing should be smooth and quiet. Panting, wheezing, or open-mouth breathing in cats always requires urgent veterinary attention.
• Hydration status: Skin should return to place quickly when gently lifted at the shoulders. Slow recovery may suggest dehydration.

Simple Checklist for Monitoring Your Cat’s Health

Daily:

• Appetite: Observe your cat’s eating habits. A sudden decrease in appetite could indicate an underlying health problem.
• Drinking: Ensure your cat is drinking enough water. Dehydration may lead to kidney or urinary issues.
• Toilet Habits: Check your cat’s litter box daily for changes in the colour, consistency, or amount of stool and urine. Alterations could suggest digestive or urinary issues.

Weekly:

• Coat Brushing: Brush your cat’s coat to prevent matting and remove dead fur. It’s also an opportunity to detect skin problems or parasites.
• Body Check for Lumps: Gently run your hands along your cat’s body to feel for any unusual lumps or bumps. Early detection of lumps could help identify issues like tumours or infections.

Monthly:

• Teeth Inspection: Examine your cat’s teeth and gums for signs of plaque or tartar buildup. Check for any gum inflammation or signs of oral disease.
• Nail Trimming: Trim your cat’s nails as needed. Overgrown nails can cause discomfort and potential injury.

Here are the symptoms of a cat’s health problem:

• Vomiting: Frequent vomiting could indicate gastrointestinal issues such as infections, parasites, or food intolerances. In more serious cases, vomiting may be linked to conditions like pancreatitis, kidney disease, or even cancer. If persistent, consult your vet.
• Diarrhoea: Ongoing diarrhoea can result from infections, dietary changes, or parasitic infestations. It may also signal chronic conditions like inflammatory bowel disease. If the issue lasts more than 24 hours, or if your cat becomes lethargic or dehydrated, see your vet.
• Weight Loss: Unexplained weight loss can be a sign of diseases like hyperthyroidism, diabetes, or cancer. If your cat is eating normally but still losing weight, it’s crucial to seek veterinary advice.
• Weight Gain: Sudden weight gain, especially when accompanied by lethargy, could be a sign of conditions like hypothyroidism, kidney disease, or heart problems. Rapid weight gain should not be ignored.
• Bad Breath: Bad breath, especially if foul or fruity, often signals oral health issues like gum disease or tooth decay. Sweet-smelling breath may indicate diabetes, while ammonia-like breath can point to kidney disease.
• Excessive Thirst: Increased thirst is a key indicator of health problems like kidney disease, diabetes, or hyperthyroidism. If your cat drinks significantly more water than usual, consult with your vet.
• Loss of Appetite: A sudden decrease in appetite can signal many health issues, including dental pain, infections, or serious conditions like kidney or liver disease. If your cat isn’t eating for more than a day, seek professional advice.
• Polyphagia (Increased Hunger): Excessive hunger (polyphagia) can be a sign of diabetes, hyperthyroidism, or parasites. If your cat’s appetite increases despite weight loss, it’s a red flag that needs investigation.
• Rhinorrhea (Nasal Discharge): Nasal discharge, whether clear or thick, often indicates a respiratory infection or allergies. If the discharge persists or is accompanied by sneezing, coughing, or laboured breathing, visit your vet.
• Lethargy: Lethargy or a noticeable lack of energy can be a sign of various illnesses, ranging from mild infections to more severe conditions like heart disease or cancer. Cats that suddenly become inactive or sleep excessively should be seen by a vet.
• Difficulty Urinating or Defecating: Straining to urinate or defecate can be a sign of urinary tract infections, kidney disease, constipation, or even a blocked urinary tract, which requires immediate attention. If your cat is unable to urinate, this is a medical emergency.
• Hair Loss: Excessive hair loss or bald patches may be caused by skin allergies, fungal infections, or parasites like fleas. If hair loss is widespread or associated with sores or itching, consult your vet.
• Hiding: Cats often hide when they’re feeling unwell or in pain. If your cat is hiding more than usual, particularly when accompanied by other symptoms like loss of appetite or lethargy, it’s a sign they may be unwell and need veterinary care.
• Seizures: Seizures are a serious health concern and can result from conditions like epilepsy, brain tumours, or toxins. If your cat experiences a seizure, seek emergency veterinary care immediately.
• Behavioural Changes: Sudden behavioural changes, such as aggression, increased vocalisation or excessive irritability, can be a sign of stress, pain, or a health issue. Cats that become unusually shy, aggressive, or fearful need to be examined by a vet.
• Shortness of Breath: Difficulty breathing or laboured breathing could be a sign of respiratory infections, asthma, heart disease, or fluid in the lungs. This condition requires immediate veterinary attention to prevent further complications.
• Grooming Problems: If your cat stops grooming or is over-grooming, it may be due to skin infections, allergies, or stress. A sudden change in grooming habits is often a sign of an underlying health issue.
• Polyuria (Increased Urination): Increased urination, often seen alongside increased thirst, may signal diabetes, kidney disease, or hyperthyroidism. If your cat is urinating more frequently or in large volumes, it’s essential to have them checked by a veterinarian.
• New Litter Box Behaviour: Changes in litter box habits, like urinating outside the box or straining to pass urine, may indicate urinary tract infections, kidney disease, or diabetes. Sudden changes in behaviour should not be ignored.
• Aggression: Increased aggression may result from pain, stress, or neurological conditions. If a typically gentle cat becomes more irritable or aggressive, it’s time for a veterinary evaluation.
• Limping or Injuries: Limping or signs of pain when walking or jumping may indicate injury, arthritis, or other musculoskeletal problems. Immediate attention may be needed, particularly if the limp persists.
• Uncontrolled Bleeding: If your cat is bleeding from any part of the body and you cannot stop it, this is a medical emergency. It could be due to injury, a clotting disorder, or internal bleeding, all of which require immediate veterinary intervention.
• Vocalising: Excessive vocalisation can indicate discomfort, stress, or illness. If your cat starts yowling, meowing more than usual, or making unusual sounds, this change should not be ignored, as it can be a sign of pain or distress.
• Lumps: Lumps or bumps on your cat’s body, especially those that are hard, growing, or painful, may be benign or malignant tumours. If you detect any unusual lumps, schedule an appointment with your vet to determine whether they are a cause for concern.

Dental Disease

Dental disease is one of the most common health issues in cats, often causing gingivitis, periodontal disease, and tooth decay. Symptoms include bad breath, difficulty eating, or excessive drooling. Bad breath, as highlighted earlier, is a key indicator of dental issues. If left untreated, these problems can lead to painful infections, tooth loss, and systemic health issues. Regular dental care, including check-ups and cleanings, is essential for prevention.

Obesity

Obesity is a growing problem in domestic cats, often linked to overfeeding and a lack of exercise. Overweight cats are at higher risk for diabetes, joint issues, and heart disease. Symptoms include weight gain, lethargy, and difficulty grooming. As noted earlier, weight gain can be a precursor to other serious health conditions. Keeping your cat at a healthy weight through portion control and regular exercise is key to preventing obesity-related illnesses.

Digestive Problems

Vomiting, diarrhoea, constipation, and other digestive issues are common in cats. These problems can stem from food allergies, parasites, infections, or more serious conditions like inflammatory bowel disease (IBD). As discussed earlier, vomiting and diarrhoea are signs of digestive disturbances. If these symptoms persist, it’s essential to seek veterinary help to address the root cause, whether it’s dietary, parasitic, or disease-related.

Parasitic Infestations

Fleas, ticks, and intestinal worms are common parasites that can cause a variety of health problems, including itching, vomiting, and diarrhoea. Excessive scratching and visible worms in the stool are red flags. Regular flea and deworming treatments are crucial to prevent parasitic infestations. A thorough veterinary exam can identify and treat any parasites effectively.

Skin Disorders

Skin issues in cats, including allergies, ringworm, and flea infestations, are quite common. Symptoms typically include itching, hair loss, and skin lesions. Excessive scratching and hair loss, as mentioned earlier, are signs that your cat may be suffering from a skin condition. Early veterinary intervention can help treat the condition before it worsens, and regular grooming can prevent some skin issues from developing.

Feline Leukemia Virus (FeLV)

FeLV is a viral infection that weakens the immune system, leaving cats vulnerable to other infections and cancers. Symptoms can include lethargy, loss of appetite, weight loss, and fever. As discussed earlier, cats with FeLV are more prone to infections and other serious conditions. Early detection is key, as FeLV can be managed with proper care, but there is no cure. Regular screening is recommended, especially for outdoor cats.

Feline Immunodeficiency Virus (FIV)

FIV is a viral infection that weakens the immune system, similar to HIV in humans. It makes cats more susceptible to infections and other diseases. Symptoms include fever, weight loss, and recurrent infections. Behavioural changes or aggression may also be present. As highlighted earlier, aggression or sudden changes in behaviour could be a sign of FIV. Although there’s no cure, early diagnosis allows for treatment to manage symptoms and improve the cat’s quality of life.

Upper Respiratory Infections

Upper respiratory infections (URIs) are common in cats and are typically caused by viruses or bacteria. Symptoms include sneezing, nasal discharge, coughing, and fever. As discussed earlier, coughing and wheezing are major indicators of respiratory issues. URIs are treatable, but prompt veterinary care is necessary to prevent complications, especially in young or immunocompromised cats.

Kidney Disease

Chronic kidney disease (CKD) is a common issue in older cats, leading to the gradual decline of kidney function. Symptoms include increased thirst, increased urination, loss of appetite, and weight loss. Excessive thirst and polyuria are key signs, as noted earlier. Early diagnosis through blood and urine tests allows for management, which can improve quality of life and help prevent further damage to the kidneys.

Hyperthyroidism

Hyperthyroidism is a common condition in older cats, caused by an overactive thyroid gland. It leads to increased metabolism and symptoms like weight loss, increased appetite, hyperactivity, and vomiting. As mentioned earlier, weight loss despite an increased appetite is a major symptom of this condition. Hyperthyroidism can be managed with medication, surgery, or radioactive iodine therapy, and early treatment is critical to avoid complications.

Heart Disease

Heart disease in cats can result from a variety of causes, with hypertrophic cardiomyopathy being the most common. Symptoms include shortness of breath, lethargy, and reduced exercise tolerance. As noted earlier, shortness of breath should be addressed immediately, as it may indicate heart problems. Early detection and treatment can help manage heart disease and improve the cat’s quality of life.

Kittens (0-6 months)

Kittens need frequent vet visits to ensure they are growing properly and staying up to date with vaccinations. Every month until vaccinations are completed is essential. During these visits, the vet will monitor your kitten’s development, provide vaccinations, and ensure they are free from parasites. Regular check-ups are crucial in the early stages to address any health issues and set the foundation for lifelong health.

Adults (3-6 years)

For adult cats, yearly vet check-ups are recommended to maintain general health. These visits are important for preventive care, such as vaccinations, dental health, and parasite control. Annual check-ups help detect any emerging issues before they become significant problems, ensuring your cat remains healthy and active as they age.

Seniors (7+ years)

Senior cats (7 years and older) are more prone to age-related health conditions such as kidney disease, arthritis, and diabetes. For these cats, health checks every six months are crucial. Semi-annual visits allow your vet to monitor for these common conditions and address any new health concerns early, ensuring your senior cat enjoys a high quality of life.

Preventive care protects against illness, supports long-term health, and reduces emergency treatment needs. Cats benefit most from structured, age-appropriate prevention covering vaccines, parasite control, dental hygiene, and regular monitoring.

Regular Veterinary Checkups: Baseline Health Monitoring

Routine checkups help detect health issues before they become severe. Kittens may need monthly visits, adults typically require annual exams, and seniors benefit from twice-yearly visits. These checkups cover:

• Physical examinations
• Vaccination updates
• Parasite prevention
• Nutritional and behavioural assessments

Regular visits form the foundation of any wellness plan, allowing early intervention and personalised care.

Vaccinations: Core Protection Against Viral Diseases

Core vaccinations shield cats from life-threatening infections. These include:

• Feline Viral Rhinotracheitis (FHV-1)- protects against upper respiratory disease
• Calicivirus (FCV)- prevents oral ulcers and respiratory symptoms
• Panleukopenia (FPV)- guards against feline distemper, a severe gastrointestinal virus

These vaccines are essential from kittenhood and require scheduled boosters. Immunisation protocols are typically bundled into feline wellness plans for easy compliance.

Parasite Prevention: Internal and External Defence

Parasites affect skin, digestion, and systemic health. Preventive control targets:

• Fleas: cause itching, anaemia, and dermatitis
• Ticks: transmit bacterial infections
• Worms: disrupt digestion and nutrient absorption

Monthly or seasonal treatments prevent infestations. Preventive care plans often include parasite screenings and prescribed treatments.

Nutrition and Weight Management: Disease Risk Reduction

Balanced diets and healthy body weight reduce the risk of:

• Diabetes
• Joint problems
• Heart disease

Veterinarians assess body condition score (BCS) and recommend tailored feeding plans. Wellness programs often include dietary consultations and regular weight tracking to detect early imbalances.

Dental Care: Prevent Pain and Infection

Over 70% of cats show signs of dental disease by age 3. Preventive measures include:

• Annual oral exams
• Dental cleanings
• At-home brushing or dental diets

Dental care prevents halitosis, tooth loss, and secondary infections. Most cat wellness plans feature dental health evaluations and professional cleaning discounts.

Grooming: Skin and Coat Health Monitoring

Regular grooming prevents matting, hairballs, and skin infections. It also helps with:

• Early detection of lumps, parasites, or skin lesions
• Reducing hair loss and excessive shedding

Brushing frequency depends on breed and coat type. Grooming routines support hygiene and comfort, especially in long-haired or elderly cats.

Spaying or Neutering: Behavioural and Health Benefits

Spaying or neutering helps prevent:

• Unwanted pregnancies
• Certain cancers (e.g., uterine or testicular)
• Behavioural issues like spraying or roaming

This one-time preventive procedure reduces health risks and improves temperament. It’s typically recommended before sexual maturity and included in most kitten wellness plans.

Environmental Enrichment: Mental and Physical Wellbeing

A stimulating home environment supports overall health by reducing:

• Stress-related behaviours (e.g., overgrooming, aggression)
• Obesity from inactivity
• Destructive habits linked to boredom

Enrichment strategies include toys, scratching posts, perches, and interactive play. Mental stimulation plays a vital role in preventive behavioural health.