Cat Fleas Vs Dog Fleas

Cat fleas, dog fleas. Two different bugs. Most people assume cat fleas only bother cats and dog fleas only bother dogs. Not how it works. A friend’s vet told her the dog had cat fleas. No cat in the house. Hadn’t seen one in years. She thought the vet was wrong.

She wasn’t wrong. Cat fleas (Ctenocephalides felis) and dog fleas (Ctenocephalides canis) are different bugs. You need a microscope to tell them apart. But either one lives on either pet. In North America it’s mostly cat fleas, on cats and dogs both. Dog fleas barely show up here at all.

Who bites who

Both species need warm blood to survive. That’s the whole game. Both can live off human blood too, for a stretch, if nothing better’s around.

Cat fleas run the show in North America. They’re not picky about hosts either. Opossums, squirrels, raccoons, mice, birds, foxes. If your dog’s never met a cat, that doesn’t mean anything. Wildlife in the yard is enough.

The life cycle: eggs drop off the pet, land in your carpet or yard or wherever. They hatch into larvae. Larvae eat whatever’s around, including adult flea droppings. Then they spin a cocoon and wait as pupae, sometimes for weeks, until something tells them a host’s nearby. Vibration, body heat, CO2. That’s what wakes them up. First bite usually happens within a day or two after that.

Where each one lives

Cat fleas like it warm and humid. Texas, Oklahoma, the whole Gulf region. Dog fleas do better in cooler climates, Canada down through New England.

An outdoor cat can pick up either species. A dog usually just gets whatever’s dominant nearby, which in most of the US is cat fleas, cat or no cat.

Size difference

Cat fleas: 1.5 to 3.2mm. Females bigger, around 2.5mm. Males smaller, under 2mm. Female heads look kind of long and narrow for the body.

Dog fleas: same size range, but lighter belly, dark stripes on the back. Bigger head relative to body size than a cat flea has.

Do cat fleas get on dogs?

Constantly. They jump from cat to dog, dog to person, whatever’s closest. Rabbits and guinea pigs too, not just cats and dogs.

Can they live on you?

They’ll bite. They won’t stay. Neither species breeds on human blood — something about the conditions isn’t right, maybe the heat and humidity our skin doesn’t match. They come for your body heat, the CO2 you breathe out, movement if you’re scratching something.

Bites itch. Sometimes swell. Some people get real skin reactions from it. As for your hair — yeah, fleas can hide there a bit if they can’t find a pet. They don’t stay. Hair doesn’t protect them from light and dryness the way fur does.

Same with clothes. They might grab onto a hem for a day, tops. Wash your stuff after being somewhere infested. Dryer on high heat works too.

Eggs land in carpet and furniture sometimes. They hatch into larvae that basically can’t move on their own. Vacuum regularly if you’ve got pets. Doesn’t matter if they’re infested right now or not.

Does dog flea treatment kill cat fleas?

Usually yes. Most treatments — Bravecto’s one example — aren’t picky about species. They kill fleas, period. Still worth checking with your vet given your pet’s age and weight and whatever else they’re on. And if you’ve got a cat and dog both, treat them together. One bite passes fleas between them fast, so treating just one does nothing.

Comb daily while it’s active. Fleas aren’t always visible even during a real infestation. The comb catches what your eyes miss.

Treating the house

• Vacuum everything. Floors, under furniture, carpet, couches. Every few days till you stop finding signs of them.
• Wash pet bedding weekly, hot water. Kills eggs and larvae hiding in there.
• Treat the yard if you’re seeing adults outside. Check it’s pet-safe first.
• Ask your vet about a monthly treatment for anything more than mild. Most handle the environment too, not just the pet.
• A proper flea bath hits every life stage, eggs included.
• Diatomaceous earth if you want to skip chemicals. Works in carpet and along baseboards. Kills by drying them out, nothing chemical about it.

Bottom line

Cat fleas, dog fleas, either can end up on either pet. Cat fleas just dominate North America. Bites itch, sometimes badly. They’ll hide in your hair for a bit but won’t stay — your skin’s not what they need to survive.