Conducted research established that the affection of dogs with dirofilaria is influenced by different factors: age, sex, breed, type of content, seasonality.

The most affected were dogs at the age of 4-6 years. There were more males dirofilarios dogs than females. Higher extensity of infestation was recorded in dogs of the following breeds: German shepherd, Caucasian shepherd, Dachshund, Husky and mongrel. Mongrels were the most infested, the extensity of invasion of which constituted 35.9 %. To a lesser extent apartment dogs  were affected, extensity of invasion of which was 10.2 %.

Clinically in dirofilarios dogs were observed coughing, heavy breathing, depression, feed refusal, increased belly, conjunctivitis. At auscultation the noise during systole and arrhythmias was found. Observed edema, elephantiasis of limbs, nervous phenomena, as a result of intoxication hemolytic anemia and leukocytosis was developing.

The treatment regimen using dectomax at a dose of 1 ml per 16 kg body weight subcutaneously, glucose with ascorbic acid, isotonic solution of sodium chloride, fraxiparina, diphenhydramine, otoprotection, Riboxin, catosal and amoxicillin was effective and led to the restoration of the clinical condition and hematological parameters in dogs with dirofilariosis without complications.

Key words: dirofilariosis, dogs, breed, age, gender, type of content, extensiveness of invasion, diagnosis, treatment, dectomax.