Yes — but only in certain situations. Dogs and cats can pass a few illnesses to each other, but most of their common diseases are species-specific (meaning they don’t usually cross over). Here’s a breakdown:
🦠 Illnesses That Can Be Shared
- Parasites: Fleas, ticks, and some intestinal worms (like roundworms and hookworms) can pass between dogs and cats.
- Ringworm (fungal infection): Highly contagious between pets — and to humans, too.
- Certain viruses/bacteria: Rare, but things like Bordetella (kennel cough) or some strains of influenza can occasionally spread.
🐾 Illnesses That Usually Don’t Spread
- Most respiratory infections (like cat flu or dog-specific kennel cough) are unique to each species.
- Feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) affect only cats, not dogs.
- Canine parvovirus affects only dogs.
🛡️ How to Reduce Risk
- Keep both pets up to date on vaccinations and parasite prevention.
- Don’t let them share food or water bowls if one is sick.
- Quarantine your sick pet until a vet confirms it’s safe.
👉 Bottom line: Your dog can make your cat sick in some cases, but most illnesses don’t cross between species. The biggest shared risks are parasites, ringworm, and some bacteria.