Picture the scene. Your dog just licked your cat’s face, your cat licked back, and now they’re curled up sharing the same blanket. Sweet, right? Then a worry pops into your head. If one of them gets sick, does the other one catch it too? It’s a fair question, and if you’ve ever wondered whether cats and dogs get each other sick, you’re not alone.
Here’s the honest answer. Some things spread between them, and some things really don’t. The good news is that the scariest viruses tend to stay in their own lane. The stuff that does cross over is mostly preventable with a bit of routine care. Let’s break down exactly what jumps between species and what doesn’t.
- Fleas move freely between cats and dogs and can carry tapeworm to both, so treat every pet in the home at the same time.
- Roundworms and hookworms spread through shared litter boxes, feces, and contaminated soil, so they can pass between cats and dogs living together.
- Ringworm is a contagious fungus that spreads between cats, dogs, and people through direct contact or shared bedding.
- Feline panleukopenia, FIV, and FeLV do not infect dogs, and canine parvovirus and distemper do not cause disease in cats the usual way.
- Bordetella (kennel cough) can pass from dogs to cats through close contact, coughing, and shared spaces.
Can cats and dogs actually make each other sick?
Yes, cats and dogs can make each other sick, but the risk is limited to parasites and a handful of bacteria and fungi. Most of their serious diseases are species-specific, which means the virus is built to infect one species and can’t easily set up shop in the other. So while your cat and dog can swap fleas and worms, they usually can’t swap the big viral illnesses that scare pet parents most.
Think of it in two buckets. Bucket one is the shared stuff: fleas, intestinal worms, ringworm, and a few respiratory bugs. Bucket two is the species-only stuff: the major viruses that stay put. Knowing which is which takes a lot of the worry out of a multi-pet home.
What can cats and dogs pass to each other?
Cats and dogs mainly share parasites and a few contagious bacteria or fungi. These spread through fleas, shared feces, contaminated soil, direct contact, and close-quarters coughing. If you’ve got both animals under one roof, these are the ones to plan around.
- Fleas. Fleas don’t care which pet they land on. They hop between cats and dogs happily, and a flea problem on one animal quickly becomes a whole-house problem. Staying on top of a good cat flea treatment for every pet is the single best move here.
- Tapeworm. Tapeworm often rides in on fleas. When a cat or dog swallows an infected flea while grooming, it can pick up tapeworm, which is exactly why cats get tapeworms in the first place.
- Roundworms and hookworms. These intestinal worms spread through feces and contaminated soil. A shared yard or a litter box a curious dog raids can pass them along. Regular deworming for your cat and dog keeps both protected.
- Ringworm. Despite the name, ringworm is a fungus, not a worm. It spreads through direct contact and shared beds, brushes, and blankets, and it jumps between cats, dogs, and humans.
- Bordetella (kennel cough). Cats can catch Bordetella bronchiseptica from a coughing dog through close contact and shared air. If one pet develops a cough or your cat won’t stop sneezing, keep them apart and call your vet.
- Giardia. Giardia is an intestinal parasite that causes diarrhea. The most common cat and dog strains are fairly species-specific, so direct pet-to-pet spread is less common than people assume, but a shared contaminated environment can still infect both.
What can’t cats and dogs give each other?
Cats and dogs cannot give each other their major species-specific viruses. These viruses evolved to lock onto one species, so they don’t cross over in normal home conditions. This is the part that should calm a worried pet parent, because these are the illnesses with the scariest reputations.
Feline panleukopenia (feline “parvo”) infects cats but does not harm dogs. Canine parvovirus and canine distemper cause disease in dogs and don’t cause typical illness in cats. FIV (feline immunodeficiency virus) and FeLV (feline leukemia virus) are cat-only and pose no threat to your dog. Feline herpesvirus and calicivirus, the usual causes of cat colds, also stay within cats. So your dog’s kennel-mate history won’t give your cat leukemia, and your cat’s sniffles won’t give your dog distemper.
Which illnesses spread between cats and dogs?
The clearest way to see the split is a side-by-side look. This table sums up the common shared threats, how they move, and whether they can also reach people.
| Illness or parasite | How it spreads between cats and dogs | Can it infect people? |
|---|---|---|
| Fleas | Jump directly between pets and around the home | Can bite people, rarely infest |
| Tapeworm | Swallowing an infected flea while grooming | Rarely, usually via fleas |
| Roundworms / hookworms | Feces, litter box, contaminated soil | Yes (zoonotic) |
| Ringworm | Direct contact, shared bedding and brushes | Yes (zoonotic) |
| Bordetella (kennel cough) | Coughing, close contact, shared air | Rare, mainly if immune-compromised |
| Feline panleukopenia, FIV, FeLV | Does not infect dogs | No |
| Canine parvovirus, distemper | Does not cause typical illness in cats | No |
How do I stop my cat and dog from sharing illnesses?
Protecting a multi-pet home comes down to treating everyone as a team. Since fleas and worms move freely between cats and dogs, treating just one pet leaves a back door open for reinfection. Handle the whole household together and you close that gap.
Treat every pet for fleas and worms on the same schedule. A flea living on your dog will happily reinfest a freshly treated cat, so year-round prevention for all pets is what actually breaks the cycle. Ask your vet for cat-safe products, because some dog flea treatments are toxic to cats.
Keep litter boxes away from the dog, scoop daily, and pick up yard waste promptly to cut down on worm spread. Wash shared bedding, brushes, and toys regularly, especially if ringworm shows up. And give new pets a vet check before introducing them, so an unknown infection doesn’t get a head start.
Can I catch anything from my cat or dog?
Yes, a few of the shared conditions are zoonotic, meaning they can pass from pets to people. Ringworm, roundworms, and hookworms top that list, which is why washing your hands after scooping litter or cleaning up the yard matters. According to the CDC’s healthy pets guidance, basic hygiene handles most of the risk.
The people most at risk are young children, older adults, and anyone with a weakened immune system. For a deeper look at what cats specifically can pass to humans, the Cornell Feline Health Center is a trustworthy place to read up. For general pet health explainers, VCA Hospitals keeps things clear and vet-reviewed.
When to see a vet: Call your vet if either pet has ongoing diarrhea, vomiting, a persistent cough, hair loss with round crusty patches, or visible worms in stool. This article is educational and not a substitute for veterinary care, so a professional exam is the right move whenever something seems off.
Frequently asked questions
Q: Can my dog catch a cold from my cat?
Not the usual cat cold. Feline herpesvirus and calicivirus, the common causes of cat colds, are species-specific and don’t infect dogs. The one respiratory bug that can cross over is Bordetella (kennel cough), which can pass from a coughing dog to a cat.
Q: Can cats get parvo from dogs?
Cats do not catch canine parvovirus the way dogs do. Cats have their own version called feline panleukopenia, sometimes nicknamed feline parvo, and it does not spread from dogs to cats under normal home conditions. The two viruses are closely related but adapted to different species.
Q: Can fleas from my dog get on my cat?
Yes, fleas move freely between dogs and cats and around your home. This is why treating only one pet rarely works. Put every animal in the household on year-round, cat-safe flea prevention to break the cycle.
Q: Is ringworm from a dog dangerous to my cat?
Ringworm spreads easily between dogs, cats, and people through direct contact and shared bedding. It’s usually treatable and not life-threatening, but it’s contagious and itchy. See your vet for antifungal treatment and wash shared items to stop it spreading.
Q: Can my cat give my dog worms?
Yes, roundworms, hookworms, and tapeworm can pass between cats and dogs. Worms spread through feces, contaminated soil, and infected fleas. Regular deworming for every pet, plus daily litter scooping, keeps the whole household protected.
Q: Should I separate a sick pet from the other one?
Yes, separating a sick pet is smart while you sort out what’s wrong. Keep them apart until your vet confirms whether the illness can spread. This is especially wise for coughing, diarrhea, or skin lesions, which point to conditions that can cross species.
Q: Can I catch something from both my cat and dog?
Yes, a few shared conditions are zoonotic, including ringworm, roundworms, and hookworms. Good hand-washing after handling pets, litter, or yard waste greatly lowers the risk. Young kids, older adults, and immune-compromised people should take extra care.
Q: Do indoor-only pets still need parasite prevention?
Yes, indoor pets still need it, especially in a multi-pet home. Fleas hitch rides indoors on people and other animals, and worm eggs can arrive on shoes or a dog that goes outside. Year-round prevention for every pet is the safest approach.
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