Common Dog Illnesses: Early Symptoms, Breed Risks, and Prevention Tips for Healthy Pets

Dogs are vulnerable to a variety of health issues, ranging from minor infections to life-threatening diseases. Because many conditions progress silently, early detection is critical. Recognising subtle changes in your dog’s behaviour or appearance can lead to faster diagnosis and treatment. Regular veterinary check-ups play a vital role in preventing and managing these common dog illnesses. At ASL Vets, we’re committed to delivering expert, affordable, and compassionate care tailored to your dog’s age, breed, and lifestyle, helping them live a longer, healthier life through every stage.

Dogs can suffer from a range of illnesses, some of which are mild and treatable, while others can become life-threatening if not addressed early. Understanding the most common dog illnesses helps owners take timely action and seek veterinary care before complications develop.

Infectious Diseases

These illnesses are caused by viruses, bacteria, or parasites and often spread through direct contact, insect bites, or contaminated environments:

• Parvovirus:  A severe and highly contagious viral disease that attacks the digestive tract, especially in puppies. Symptoms include bloody diarrhoea, vomiting, and lethargy. It can be fatal without prompt treatment.
• Canine Distemper:  A serious viral illness affecting the respiratory, gastrointestinal, and nervous systems. It causes coughing, fever, discharge from eyes and nose, and in later stages, seizures and paralysis.
• Kennel Cough (Canine Infectious Respiratory Disease Complex):  A common and contagious respiratory illness, causing a dry, hacking cough. It spreads quickly in kennels and dog parks.
• Leptospirosis: A bacterial infection spread via contact with contaminated water or soil. It affects the liver and kidneys and can be passed to humans (zoonotic).
• Heartworm Disease: Transmitted by mosquitoes, this condition causes worms to grow in the heart and lungs, leading to coughing, fatigue, and potentially heart failure. It’s more common in warmer climates but is preventable with medication.
• Lyme Disease: Spread by ticks, it causes joint pain, fever, and lameness. It can progress to chronic pain or kidney problems if left untreated.

Chronic Conditions and Degenerative Diseases

These illnesses often develop over time, especially in older or genetically predisposed dogs:

• Arthritis: A common degenerative joint disease, especially in senior and overweight dogs. Symptoms include stiffness, limping, and reluctance to exercise.
• Obesity: A growing concern in many UK dogs. Overweight pets are at higher risk for diabetes, heart problems, joint stress, and reduced lifespan.
• Cataracts: Clouding of the eye lens, leading to impaired vision or blindness, especially in senior dogs. Cataracts can be genetic or caused by diabetes.

Dental and Ear Conditions

Issues in the mouth and ears are frequent, especially if hygiene isn’t maintained.

• Dental Disease (Periodontal Disease): Affects over 80% of dogs over the age of three. Plaque buildup leads to gingivitis, bad breath, tooth loss, and in severe cases, organ damage due to bacterial spread.
• Ear Infections: Often caused by bacteria, yeast, or mites. Dogs with floppy ears (e.g., Spaniels) are more prone. Symptoms include scratching, head shaking, redness, and odour.

Skin and Allergy-Related Problems

Skin conditions may be caused by parasites, environment, or underlying medical issues:

• Skin Problems: Includes dermatitis, flea allergies, mange, and infections. Symptoms are itching, redness, hair loss, or scabs. Many are seasonal or breed-related.

These illnesses can often be prevented or managed with routine check-ups, timely vaccinations, and proper hygiene. Visit our Preventive Care and General Consultations pages to learn how we can help keep your dog protected.

Dogs may hide pain, but changes in behaviour or appearance often reveal illness. Some Common symptoms to monitor:

• Vomiting or diarrhoea: May result from diet change, infection, or ingestion of harmful substances. Persistent episodes need veterinary attention.
• Increased or decreased urination: Frequent, strained, or bloody urination can indicate kidney disease, urinary infection, or diabetes.
• Loss of appetite: Skipping meals may point to dental issues, nausea, or internal illness.
• Change in drinking habits: Drinking more or less than usual can suggest hormone imbalance, fever, or organ issues.
• Unexplained weight loss or gain: Sudden changes can reflect metabolic disease, parasites, or digestive problems.
• Behavioural changes: Withdrawal, aggression, or excessive clinginess may signal pain or neurological concerns.
• Coughing or breathing problems: Could indicate kennel cough, heart disease, or respiratory infection. Urgent if breathing becomes laboured.
• Itchy skin or hair loss: Often caused by fleas, allergies, or skin infections. Look for redness, sores, or flea dirt.
• Lameness or stiffness: Joint disease, arthritis, or injury may cause limping or difficulty standing.
• Eye changes: Discharge, redness, or squinting can suggest infection, trauma, or glaucoma.
• Pale gums: Pale or white gums can indicate shock, anaemia, or internal bleeding. Seek urgent care.

Certain dog breeds are genetically predisposed to specific illnesses due to their physical traits and breed history. Understanding these risks helps owners spot issues earlier and manage their dog’s health more effectively.

Breed-specific veterinary care improves early diagnosis and treatment outcomes. At ASL Vets, we offer tailored wellness plans that factor in these risks during general consultations and preventive care.

Here’s a detailed list of common breed-health risk pairings:

Flat-Faced Breeds (Brachycephalic Breeds)

Dogs with short snouts often suffer from respiratory and eye conditions due to their anatomy.

• Bulldogs & French Bulldogs: Prone to brachycephalic obstructive airway syndrome (BOAS), skin fold infections, cherry eye, and spinal malformations. Respiratory distress can worsen in warm weather or after exercise.
• Pugs: Frequently develop breathing problems, corneal ulcers, herniated discs, and degenerative myelopathy. Their prominent eyes and compact skulls increase ocular risk.

Large and Giant Breeds

Larger dogs commonly develop joint, bone, and heart conditions due to rapid growth and weight-bearing stress.

• German Shepherds: Often diagnosed with hip and elbow dysplasia, degenerative myelopathy, and various cancers. Their active nature makes them vulnerable to orthopaedic issues.
• Rottweilers: Susceptible to joint problems, osteosarcoma, and congenital heart disease, including aortic stenosis.
• Great Danes: Frequently affected by hip and elbow dysplasia. Also at high risk for dilated cardiomyopathy and gastric torsion (bloat), which is life-threatening.

Medium-Sized and Popular Companion Breeds

Mid-size dogs often carry both structural and hereditary risks.

• Labrador Retrievers: Prone to hip and elbow dysplasia, obesity, cancer (lymphoma, mast cell tumours), and exercise-induced collapse (EIC). Weight management is crucial.
• Boxers: High prevalence of cancers, especially mast cell tumours and lymphoma. Also at risk of heart problems, such as arrhythmogenic right ventricular cardiomyopathy (ARVC).
• Goldendoodles: Known to carry a genetic risk for subvalvular aortic stenosis, a congenital heart condition. Routine cardiac exams are advisable.
• Beagles: Face increased risk of epilepsy, cancer, and joint disease. Their keen sense of smell and curiosity may also expose them to toxins.

Small and Toy Breeds

Smaller breeds often experience neurological, cardiac, and spinal conditions due to compact bone structure.

• Dachshunds: Extremely susceptible to intervertebral disc disease (IVDD) and spinal degeneration. Obesity significantly increases this risk.
• Cavalier King Charles Spaniels: Commonly diagnosed with mitral valve disease, syringomyelia (neurological condition), dry eye, and early-onset arthritis.
• Shar Pei: Known for Shar Pei fever, a recurrent inflammatory condition, and amyloidosis, which can lead to kidney failure.
• Cocker Spaniels: Genetically prone to epilepsy, chronic ear infections, liver disease, and heart murmurs. Their floppy ears trap moisture easily.

Working and Northern Breeds

Dogs bred for endurance or cold climates often develop autoimmune or organ-specific diseases.

• Siberian Huskies: Predisposed to autoimmune skin diseases such as pemphigus and lupus. Also prone to juvenile cataracts and zinc deficiency.

If your dog shows any unusual behaviour or physical symptoms, it’s important to know when to seek veterinary care. Here’s a quick guide:

Emergency Veterinary Care – Seek Immediate Help

• Breathing difficulties: Laboured breathing, panting excessively at rest, pale or blue gums.
• Seizures: Jerking movements, unresponsiveness, or twitching limbs.
• Uncontrolled bleeding: Persistent bleeding from wounds, nose, or mouth.
• Sudden collapse: Fainting, falling over, or inability to get up.
• Serious injury or trauma: Road accidents, broken bones, deep cuts, or bite wounds.
• Toxin ingestion: Swallowed human medications, chocolate, antifreeze, or other harmful substances.
• Acute illness: Sudden vomiting, extreme weakness, or rapid changes in behaviour or alertness.

Prompt Veterinary Care – Call Your Vet Soon

• Ongoing vomiting or diarrhoea: Especially with tiredness, dehydration, or blood in stool.
• Changes in eating or drinking habits: Refusal to eat, excessive thirst, or reduced fluid intake.
• Lethargy or low energy: Sleeping more, avoiding activity, or seeming withdrawn.
• Toileting issues: Difficulty urinating, unusual stool, or indoor accidents.
• Eye or ear irritation: Redness, discharge, scratching, or squinting.
• New lumps or swellings: Any growths or unusual bumps on the body.
• Lameness or mobility issues: Limping, stiffness, or reluctance to move.
• Signs of pain: Yelping, flinching when touched, or sudden behavioural changes.
• Persistent coughing: Especially if it’s deep, wet, or disrupts sleep.
• Foul breath: Could indicate dental disease or internal illness.

 When in Doubt – Always Contact Your Vet

• If you’re unsure whether your dog’s symptoms are serious, don’t wait. Speak to a qualified vet to discuss the signs.
• Timely veterinary guidance ensures your dog receives the right care and helps prevent worsening health conditions.

Preventing illness in dogs begins with proactive care. This includes timely vaccinations, preventive medications, balanced nutrition, hygiene, and regular veterinary check-ups. Early prevention reduces the risk of chronic conditions, keeps infections at bay, and supports your dog’s overall well-being. Here’s a structured breakdown of effective prevention strategies:

Vaccinations

Core Vaccines

Make sure your dog receives the essential core vaccinations. These include distemper, adenovirus (hepatitis), parvovirus, and parainfluenza (DAPP or DHPP). These diseases are serious, but preventable with routine immunisation.

Rabies Vaccination

Rabies is a fatal zoonotic disease. It’s required by law in many areas and is essential for your dog’s safety and public health.

Non-Core Vaccines

Discuss optional vaccines with your vet. These include:

• Kennel cough (Bordetella bronchiseptica)
• Leptospirosis
• Canine influenza
• Lyme disease (based on regional risk and lifestyle)

Tailored vaccination schedules are part of ASL Vets’ Preventive Care plans.

Preventative Medications

• Heartworm Prevention: Heartworms are transmitted by mosquitoes and can be fatal. Monthly preventive tablets or spot-on treatments are critical in high-risk regions.
• Flea and Tick Control: Use vet-recommended treatments such as collars, sprays, chewables, or topical solutions. Fleas and ticks cause irritation and transmit diseases like Lyme disease and ehrlichiosis.
• Routine Parasite Control: Internal parasites such as roundworms, hookworms, and tapeworms can harm your dog and even pose risks to humans. Maintain a deworming schedule advised by your vet.

Routine Vet Visits

• Annual Health Checks: Schedule full-body wellness exams at least once a year. For senior dogs, biannual visits are ideal to catch age-related conditions early.
• Screening and Early Detection: Regular consultations allow early detection of subtle issues such as heart murmurs, kidney disease, or lumps. Lab tests like blood panels or faecal exams support accurate diagnosis.

Healthy Lifestyle

• Nutritious Diet: Feed your dog a vet-approved diet suited to their life stage, breed, and health condition. Avoid overfeeding or giving table scraps.
• Access to Fresh Water: Ensure your dog always has access to clean, cool water. Hydration supports kidney function, digestion, and temperature regulation.
• Daily Exercise: Physical activity helps regulate weight, supports heart health, and reduces behavioural issues. Tailor exercise to your dog’s age and energy level.
• Weight Management: Obesity increases the risk of diabetes, arthritis, and heart disease. Maintain an ideal body condition score with portion control and daily activity.

Hygiene and Safety

• Grooming Routine: Brush your dog’s coat regularly to prevent mats, remove loose fur, and spot skin issues. Clean ears, trim nails, and inspect for parasites.
• Dental Care: Brush your dog’s teeth daily with a pet-safe toothpaste. Schedule professional cleanings to prevent gum disease and systemic infections.
• Avoid Exposure to Toxins: Store cleaning agents, medicines, chocolate, raisins, and toxic plants like lilies and sago palm out of reach. Even small doses can be fatal.
• Supervised Outdoor Time: Watch your dog closely outdoors. Avoid exposure to stagnant water, unknown plants, and other animals that might transmit disease or injury.
• Hand Hygiene: After handling your dog, especially when cleaning waste or wounds, wash your hands thoroughly to reduce disease transmission between animals and humans.