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Common Pet Illnesses 

May 21, 2025

Know the Signs and When to See a Vet

Many pets seem to think of themselves as invincible. Those playful antics can be cute, but your pet may not be as tough as they think. Our animal companions are vulnerable to a whole slew of issues.  At Highbury North Pet Hospital in London, Ontario, we often treat pets whose conditions could have been managed earlier with prompt attention.  Spotting illness early and knowing when a veterinary visit is needed is key to keeping your furry bestie happy and healthy. 

This blog from an East London, ON vet explores the most frequently seen health conditions in dogs and cats, the warning signs you should never ignore, and how quick action can make a difference in treatment outcomes.

What Are the Most Common Signs Of Illnesses in Pets?

Pets are vulnerable to a wide range of health problems, many of which share overlapping symptoms. Some pets may also develop chronic conditions such as kidney disease, thyroid disorders, or cancer as they age.  

While some symptoms may seem mild, they often indicate an underlying health issue that requires medical attention. 

Some of the most common signs of illness in pets include:

  • Gastrointestinal issues like vomiting or diarrhoea
  • Itching
  • Fever
  • Respiratory Issues
  • Lethargy
  • Change of Appetite
  • Unusual Behavior
  • Weight loss or gain
  • Limping
  • Trembling
  • Swelling or lumps
  • Persistent itching, redness, or hair loss
  • Foul-smelling breath or drooling
  • Blood in urine or stool

All of these pet health warning signs should be taken very seriously. While some symptoms may resolve on their own, it’s always better to err on the side of caution. Contact your vet immediately if you spot any signs of illness in pets. A thorough exam can catch something early, when treatment is often easier, cheaper, and most effective.

How Do Vets Diagnose Common Pet Illnesses?

Diagnosis begins with a physical examination, which is typically part of your pet’s annual wellness exam. Your veterinarian will check vital signs, examine your furry pal’s skin and eyes, feel for swelling or lumps, and ask key questions about your pet’s behaviour at home.

Depending on the symptoms, your vet may recommend bloodwork, urinalysis, fecal testing, or imaging such as X-rays or ultrasound.

At Highbury North Pet Hospital, we use advanced diagnostic equipment and in-house testing to provide fast, accurate results and get your pet the care they need as quickly as possible. 

Are Some Pets More Prone to Illness Than Others?

Yes, several factors increase a pet’s risk of developing certain illnesses. Senior pets, for example, are more likely to experience organ failure, arthritis, or cancer. Puppies and kittens are at higher risk of parasitic and infectious diseases, due to their immature immune systems.

Breed also plays a role—some dogs are predisposed to hip dysplasia, while others may have a higher risk of heart disease or respiratory issues. Likewise, certain cat breeds may be prone to inherited conditions. If you aren’t sure what breed your pet is, you may want to consider DNA tests.

Lifestyle can also affect your pet’s health. Outdoor cats, for instance, are more likely to contract diseases from other animals than indoor kitties, while active dogs may be more prone to sprains or joint injuries than a couch potato. Your vet can help you understand your pet’s unique physiology and risk factors, and develop a proactive health plan.

Some pet health warning signs are clear red flags that your furry friend needs care. Others may be more subtle. You may not know exactly when to take your pet to the vet. If in doubt, give us a call and explain what’s going on. 

What Preventative Steps Can Reduce The Risk Of Illness?

Prevention is always better than treatment. Annual wellness exams, vaccinations, parasite control, dental cleanings, and a healthy diet all contribute to reducing the risk of illness.

Routine screenings can catch health issues before they cause symptoms. At Highbury North Pet Hospital, we recommend regular bloodwork for pets over the age of seven, even if they seem healthy. Preventive care can detect early signs of illness and allow us to intervene before it progresses. Read more about preventative care here.

When Do Pets Need Urgent Veterinary Care?

If your pet is experiencing sudden or severe symptoms such as seizures, collapse, uncontrolled bleeding, bloating, or extreme lethargy, don’t wait—seek emergency veterinary care immediately.

Time-sensitive conditions like heatstroke, toxic ingestion, or urinary blockages require urgent attention. If you’re ever in doubt, call your vet and describe the symptoms. They can advise whether immediate care is necessary. Here’s a guide to help determine when it’s time for an emergency visit.

Take a Proactive Approach to Pet Health

Recognizing the signs of common pet illnesses and knowing when to take your pet to the vet can save your pet unnecessary suffering—and save you from high medical costs. Visit our Service Page to learn more about the services we offer and the type of pets we see.

Schedule A Visit To Our East London, ON Pet Clinic

If your pet isn’t acting like themselves, don’t wait it out. Contact Highbury North Pet Hospital in London, Ontario, and let us give your pet the expert care they deserve. Schedule an appointment today to keep your furry companion feeling their best.

This blog is meant to be informational only, always consult with your veterinarian for the right medical advice or treatment plan to fit your pet’s needs.

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