Pet Health, Pets and Family

Are Dog Worms Contagious to Cats – Here’s What You Need to Know

jack Russell dog and grey and white cat lying under a grey blanket looking into the camera

As I watch my cats and dogs move through life in their love hate relationships, I not only wonder what the deal is with that but also whether or not dog worms are contagious to cats.  Is there any real evidence that cats can get parasitic infections from worms from dogs? 

Many people are unaware first that your dogs may harbor parasites (see the signs of dog worms here), second, that dog worms may transfer to you and that dog parasites can spread to cats. Let’s look at all of the the facts related to dog worms being contagious to cats.

Different Types of Dog Worms

It’s important to note that there are different types of worms that can affect both dogs and cats. However, not all of these worms are contagious between the two species, and not all types of worms are species-specific. For example, roundworms are a type of worm that can infect both dogs and cats, but just roundworm can spread from dogs to cats, and other types of roundworm are not considered to be contagious between the two species.  Other common dog worms include, hookworms, tapeworms, giardia, and whipworms.

Are Dog Worms Contagious To Cats?

The answer is yes, in some cases dog worms are contagious to cats. For example, hookworms and tapeworms can be passed from dogs to cats. While not all types of worms are contagious between dogs and cats, some are. Ancylostoma braziliense hookworm is a type of hookworm that can affect both dogs and cats and spread from dogs to cats and vice-versa.  

Beige dog and cat playing in the grass together in the sunshineIt is important to test your dog regularly for worms and treat as necessary so that hookworms and tapeworms cannot transfer from your dog to your cat and further spread the infection throughout your home.

How Do Dog Worms Transfer To Cats?



While many different types of worms can infect animals, one of the most common is the roundworm which can infect both dogs and cats. Roundworms are parasites that live in the intestines of their host animals. They typically enter the body through contaminated food or water or by coming into contact with infected feces. Accordingly, if your cat and dog share living spaces there is plenty of opportunity for the roundworm to transfer.  


Once they’re inside a pet, they begin to reproduce and can quickly grow to large numbers. 

Golden lab and white and beige cat lying on a white carpet looking into the cameraWhile roundworms don’t usually cause serious illness in adult animals, they can be very dangerous to young puppies and kittens. This is because their immune systems are not yet fully developed, and they can’t fight off the infection as easily. In severe cases, roundworms can cause death.


Other worms, like tapeworms, can be transmitted to cats if they eat infected parasites. Some of the common dog parasites that can spread and cause tapeworms to cats are fleas, ticks, and mites. Your dog can get infected by these parasites when he goes for a walk or plays outside and being in proximity to a cat or other animal can transfer the parasite. Therefore, it is important to make sure that your dog is properly groomed and fleas are managed to control tapeworm infestations that can be transferred to cats.


How to Prevent a Worm Infestation in Your Pets

There are some steps you can take to help prevent your pet from getting worms. These include:

  •             First, make sure they are up to date on their vaccinations. This will help reduce their risk of exposure to infected animals.
  •             Second, keep your pet’s environment clean. This means regularly cleaning up their feces and keeping them away from areas where other animals may have defecated. If possible, designate a specific area in the house or yard for your dog to relieve itself, and make sure your cat doesn’t have access to this area (we get this can tricky!).
  •             Finally, test your pets for worms regularly and talk to your veterinarian about using medication. This will help reduce the risk of your pet contracting worms, even if they are exposed to them.  Just remember cats and dogs are very different in their ability to handle chemicals. In fact some chemicals commonly used in dogs are potentially very dangerous in cats. Never use dog deworming products on cats.

Taking these precautions can help reduce the risk of your cat getting worms from your dog.