Parasite Infections, Prevention & Treatment

Parasite Prevention & Treatment | Wellington Veterinary Hospital

Parasite Infections & Transmission

Most dogs and cats will contract some form of parasite infection within their lifetime. Almost half the kittens and puppies we see at the clinic have some, regardless of their breeder or where they come from. Common ones include tapeworms, roundworms, other gastrointestinal parasites, fleas, ticks, ear mites, or heartworm disease. Like many things in life, parasite infections are far easier to prevent than treat.

Furthermore, many parasitic diseases are zoonotic, meaning they can be transmitted to humans. This makes early detection paramount for protecting not just your pet, but you and your family members, too. That’s why we make screening for parasites a routine part of our pet wellness check-ups.

Symptoms of Parasite Infections

Parasites often remain quiet, and your pet will only start showing signs when the diseases they cause have advanced. All pet owners should recognize the warning signs and seek treatment as soon as they can.


Fleas live within the fur and leave “flea dirt” scattered beneath the fur. They cause itching, redness of the skin and general discomfort.


Ticks will be visible as small brown or grey “skin tags” on the surface of the skin surrounded by an irritated red patch of skin. Some ticks spread Lyme disease and we, unfortunately, diagnose it more often than we like to at our clinic. The symptoms are serious, long-lasting, and include weakness, poor appetite and swollen joints.

Ear Mites

Ear mites cause extreme itching within the ears and you may recognize it from the presence of dry, dark-brown debris within the ear canal. If your pet is shaking its head or tilting it from side to side and pawing at its ears in discomfort, bring them in for a checkup.

Heartworm Disease

This is one parasite that will go unnoticed until the symptoms progress and become dangerous. Your pet may experience weakness and lethargy, exercise intolerance and a cough. Severe and advanced infections cause breathing difficulties, a swollen fluid-filled belly, and unfortunately death.

Intestinal Parasites

These include tapeworms, roundworms, and other intestinal parasites. Most infections begin with no symptoms but eventually, your pet may develop diarrhea, blood within the stool, weight loss, a poor coat, a bloated abdomen, vomiting and even a cough. Intestinal parasites can easily transmit to humans and make us very sick as well.

Parasite Infections: Diagnosis & Treatment

Pet wellness checkups allow us to screen for parasites through physical examinations, as well as laboratory tests which include blood work and fecal analysis. When the tests come back negative, we all celebrate together! We will counsel you to administer parasite-prevention supplements regularly. Almost always, this prevents parasite-borne diseases from occurring.

Sometimes, unfortunately, even your best attempts to protect your pet can fall short. But the supplements help to slow down the progression of the disease so the treatment can successfully take hold.

About Wellington Veterinary Hospital

Wellington Veterinary Hospital is operated by Dr. Cliff Redford, a veterinarian with over two decades of experience. Our caring and passionate team of professionals provides a full range of services for your canine and feline companions. We are always delighted to meet new pets, answer your questions and offer preventative health care tips during free assessments with our veterinary technicians. Our location in Markham, Ontario offers plenty of free parking, convenient operating hours and a 24-hour emergency call line.

We consider the staff at Wellington our friends. They have looked after the last 2 dogs that we have had and are the most compassionate group of people I have ever met. No matter what the dogs problem, Cliff and his team have been there to help us through it. Cliff has an incredible natural quality for being able to learn as well as teach. We wouldn't take our next pet anywhere else but Welllington. THANKS TO YOU ALL.

Kim Van Blarcom

A friend reached out to me today asking what to do with the possum in his backyard. “It looks scary and dangerous” he said.
I told him to leave it. Possums don’t attack us or our pets. They’re clean and they don’t carry rabies or other diseases to give to us. And they kill ticks so they protect us from Lyme disease.
He and the possum will now coexist.

Nasty staph or fungal infection on his feet. I say it was smelly but how can you tell when it’s a skunk 🦨😝😂
I’m still learning a lot about wildlife medicine but this one was easy…my “if this was a cat” thought process is actually helpful in this situation. #skunksofinstagram

That must be the yummiest milk ever!!! Watch the other baby deer come by and wait their turn ☺️ #bambi ...

Me thinks this juvenile #trashbandit is posing. ...

Happy Independence Day weekend to our neighbours from the South. One favour please? #bekindtoanimals ...

Thank you for taking care of me Dr Cliff. #ilovemyjob ...

Ok vet students…what do you notice is wrong with this great horned owl? And list a few causes. You’re not allowed to message @strubbe.eyevet like I do 🤓#owlsofinstagram ...

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