Herbs for animals living in natural habitat are constant element in their diet. In sickness it may be observed sickness behaviour, that is specific for the species for getting better. It may be sleep and decrease nutrition or increase intake of specific. There was observed variety of feeding behavior of animals that in a reduced condition can instinctively find out suitable plants or bare space of the miry clay, which has the properties of stop diarrhea. Positive influence on animals organism have biologically active substances content in plants, for example dyes (flavonoids, anthocyanins, glycoside), tannin, mucilage, bitter, essential oil, alkaloids, terpenes, triterpenes, saponins, iridoids, naphthoquinones, anthraquinones, phenols, phenol acids and mineral salts. Biologically active substances in the appropriate amounts and proportions of the other compounds of plant treating gastrointestinal symptoms, relieve pain, they can be an antiparasitic agent, and have influence on the immune system. In different forms they are used in domesticated animal nutrition as alterative option for growth antibiotic and preventive condition rise.

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