Zylkene is a complementary feed for cats and dogs which contains a natura roduct, derived from casein, a protein in milk. It is a molecule well know o promote the relaxation of newborns after breastfeeding. Launched in Octobe 013, Zylkene has become a familiar product for veterinary surgeons ehaviorists, nurses and pet owners for use in helping pets cope when facin nusual and unpredictable situations or before occasions such as a change i heir normal environment.,Zylkene is a complementary feed for cats and dogs which contains a natura roduct, derived from