Finding a flea in a cat’s coat may not be easy. Parasites can be easily spotted in light-coloured cats as well as those with not very thick fur. Unfortunately, if you notice one flea, this usually means that there are more of them. However, the flea invasion is most easily recognised not by the presence of the insects themselves, but… their dirt. They are visible on the coat and, most of all, in places where the cat sleeps. They fall from the pet like black powder, and if you crush them, you can see dried blood. A cat attacked by fleas scratches and licks itself intensively. Biting fleas introduce antigens into the cat’s blood, causing, among other things, a strong itching. Other symptoms of flea infestation include attempts to bite the parasites out of the coat, hypersensitivity, paroxysmal skin cramps, nervousness. The consequences of flea infestation include various dermatological diseases, including flea allergy dermatitis. Fleas are also an intermediate host of the tapeworm. Multiple parasite infestations can lead to anaemia, especially in kittens.