The article is devoted to the current problem of differential diagnosis of diseases of viral etiology in small domestic animals. Viral diseases of dogs and cats are widespread among both high-breed and outbred animals. The spread of diseases is facilitated by an increase in the number of small domestic animals, the popularization of pet keeping, and cross-border operations related to the movement of animals. The possibility of using means and methods of diagnosing adenovirus infection in cattle, tentative diagnosis and differentiation of infectious hepatitis in dogs from plague of carnivores and parvovirus enteritis is being considered. Reducing the timing of diagnosis helps to increase the effectiveness of ongoing therapeutic and antiepizootic measures. The analysis of the place of carnivorous infectious hepatitis in the structure of the incidence of dogs is given. The article describes the research in the field of the possibility of using the established antigenic relationship of representatives of the adenovirus family for the in vivo and posthumous diagnosis of infectious diseases of small pets. The authors proposed a method for performing the production of serological reactions for the diagnosis of infectious hepatitis in dogs using diagnostic tools for adenovirus infection in cattle.

Main problem: The genus Morbillivirus of the family Paramyxoviridae includes agents of morbilli, plague of cattle, carnivores and small ruminants. Plague agent of carnivores causes a dangerous disease of fur animals and dogs, which in many cases ends in death. The disease is widespread everywhere, including Kazakhstan. In our country, the mixed form of the disease is most common, and the least common is the skin and nervous forms. The chronic course of plague is observed to a greater extent with the nervous form, subacute - with mixed and intestinal, acute - with cutaneous and pulmonary forms of the disease. Goal: Veterinarians have significant difficulties in diagnosing carnivorous plague. Despite the fact that serological methods for diagnosing this infection have been developed and applied for research purposes, the lack of commercial diagnostic preparations on sale significantly restrains their use by practical veterinary workers. Therefore, the diagnosis of plague of carnivores is mainly established on the basis of the symptom complex of the disease and the data of epizootic and pathological anatomical studies, the results of which are largely similar to those in some other diseases of carnivores. Scientific research in the field of means and methods of laboratory diagnostics of carnivore plague, applicable in practical veterinary medicine, is in great demand. Methods: Considering the fact that the carnivores plague and cattle plague are antigenically closely related, studies were carried out to determine the possibility of using means and methods for diagnosing cattle plague for serological diagnosis of carnivores plague. Results and their significance: It has been established that the use of means and methods for diagnosing cattle plague makes it possible to diagnose carnivore plague at all stages of the course of the disease, their use makes it possible to reliably establish a diagnosis of the disease in fur-bearing animals and dogs in a short time after the receipt of samples of material for research, even in cases of mixed viral and bacterial infections; and also to differentiate the plague of carnivores from diseases similar to it - parvovirus enteritis, infectious hepatitis and a number of others.