Object of research - methods of diagnostics and treatment of a pathology of a liver and a pancreas at dogs. A research objective - to study a functional condition of a liver and a pancreas at dogs of the hunting and decorative breeds in norm and at hepatic dystrophy alimentary and toxocaroses aetiologies. Research methods: clinical (quantity erythrocytes and leukocytes, the haemoglobin, hematocrit), biochemical (the general protein, the maintenance of urea, glucose, cholesterol, activity AsAT, AlAT, GGTP, an alpha-amilazy, lipase), parasitology ( diagnostics toxocaroses - method IFA, Kotelnikova-Hrenova, Bermana-Orlova and digestion methods in an artificial gastric juice), pathomorphologycal, statistical. Scientific novelty: for the first time at clinically healthy dogs decorative (pugs, English bulldogs) and hunting (spaniel, golden retrievers) breeds are established pedigree features erythropoiesis and biochemical structure of blood which characterise a functional condition of a liver and pancreas glands. The received results are basis for working out of informative methods of diagnostics of a pathology of a liver and a pancreas. On the basis of experimental data mechanisms of development of a pathology of a liver at dogs of decorative and hunting breeds at an excessive power food and larvae toxocarosis, the information biochemical indicators for diagnostics gepato - and pancreatic function, and the control of efficiency of the developed schemes of pathogenetic therapy of puppies of the hunting breeds at hepatic dystrophy toxocaroses for the first time are explained an aetiology. Introduction: Results of scientific researches are used in educational process on chairs of therapy and clinical diagnostics of National university of life and environmental sciences of Ukraine, Belotserkovsky national agrarian university, chairs of therapy of the Poltava state agrarian academy, the Lvov national university of veterinary medicine and biotechnologies of a name of S.Z.Gzhitsky, chair of internal illnesses of animals and physiology of Zhitomir national agroecological university. Methodical recommendations which are confirmed and accepted to introduction in practice of veterinary medicine SMG of the State committee of veterinary medicine of Ukraine are developed. Sphere (branch) of use: veterinary medicine.