Today, worming is not recommended unless necessary, and owners are advised to examine the cat's excrement once a year, if it is an indoor cat. Outdoor cats should still be wormed regularly, at least twice a year and when necessary.

Intestinal worms are divided into two main groups, which are roundworms and tapeworms. Roundworms include the Suolinkainen of the cat (Toxocara cati) and Hakamato (Ancylostoma tubaeforme). Roundworms are elongated, tape-headed worms whose length varies from one centimeter to twenty centimeters, they are mainly transmitted from the environment, via faeces. 

There are several varieties of tapeworms, of which the most relevant in this context are the Mesocestoides tapeworms, the cat tapeworm (Taenia spp.), roundworm (Dipylidium caninum), equinox chefs (Echinococcus spp.) and tapeworm (Diphyllobothrium latum). Tapeworms are flat, tape-like worms that range in size from microscopic to several meters in size and are primarily transmitted from intermediate hosts that are eaten by cats. 

Identifying the species is important in terms of what medicine needs to be given to the cat. The most common worm worldwide is intestinal, and it does not require such a broad-spectrum medicine to treat it. 

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Kittens are generally still wormed at regular intervals before being given to new homes, they are more susceptible to worms and show symptoms more easily. Most often, Kittens are wormed at least three times before delivery; at 3, 5 and 7 weeks, but it is also possible to continue worming until the end of the first vaccination program also at 9 and 11 weeks. On the other hand, if current recommendations are followed,   the mother's stool samples could be examined and the puppies dewormed according to what the examination reveals.