Veterinary practitioners may encounter a wide variety of behaviorual problems such as aggresion, anxiety, compulsive behaviours, inappropriate elimination and cognitive dysfunction in daily practice. With the advance of scientific researches regarding usage of herbs and nutraceuticals in order to treat these behavioural problems, veterinarians and animal owners look for reliable sources to gain knowladge about that therapeutics. As elucidated by many published researches, neurotransmitters such as GABA, serotonin, dopamine and norepinephrine act in pathology of many psychiatric disorders and most of the modern drugs show their mechanism of action by regulating these neurochemicals. There is increasing evidence that herbal extracts and nutraceuticals act in a similiar way with the conventional therapeutics however, lots of conventional medicines have remarkable side effect unlike herbal and nutraceutical therapeutics. Despite the increasing number of studies, the mechanism of action of these therapeutics has not been fully elucidated. This review aims to introduce recent scientific knowledge on herbal and nutraceutical remedies, that may be alternative treatment models in dog and cat behavioural problems.