The contagious diseases, by their capacity to diffuse and consequences, determine an emergency medicine when the diagnosis must be put immediately and the treatment must be instantly offered in order to take, as fast as possible, the measures of prevention and control. The canine herpes virus is produced by the Canine Herpes Virus 1 (Canide Herpes Virus 1, CHV-1) classified in the Herpes Virus Family, the sub breed of Alpha Herpes Virinae, the gender of Varicello virus. The disease has an endemic evolution, with a variable morbidity and the increasing factors (weaning, transportation, regrouping in a new environment, air currents) can worsen the evolution of the disease. Naturally, the dogs of all ages and of all the breeds are receptive. The disease occurs more frequently in the dogs between five to eighteen days, who have the most severe form of the disease. Not so long time ago, it was considered that the virus is rare in case of the dogs with a percentage of only 2,8 – 6% (two point eight to six percent), but recent studies using sensitive serum tests demonstrate that the infection is much more spread. In Great Britain it is reported a serum prevalence of 76 – 88 % (seventy six to eighty eight percentage), in Belgium 49,5% (forty nine point five percent), in Holland 40% (forty percent), and in Japan 26,2% (twenty six point two percent). 80 (eighty) herpetic viruses have been identified in animals out of which 30 in the farm animals, four herpetic viruses have been isolated from cattle, four from horses, two from swine, two from poultry and one from dogs, cats, sheep and goats. The human herpetic viruses 1 and 2 are very wide spread, estimating a 70 – 90% (seventy to ninety percent) of the adult population owning the specific antibodies. The primary infection by its type 1, orally transmitted is usually produced during the first years of life and is generally unapparent. The clinical symptoms appear in only 10% of the infections. The disease expresses by acute gum stomatitis with a systemic reaction which can be more or less severe, vesicular pharyngitis (especially at teenagers), kerato conjunctivitis and, rarely, meningo-encephalitis. At newborns it is observed an deadly generalized infection. After the initial infection and the antibodies formation, the virus exists in a state of latency for the whole individual’s life and can be reactivated, which leads to relapses, generally under the form of labial (lip) herpes without a systemic reaction. The herpetic virus type 2, transmitted only sexually, determines, first of all, a genital localization. The infection with human herpetic virus type 1 and 2 was signaled in monkeys which evolves as severe generalized diseases resulting in death.The Human Herpetic Virus type 3 produces chicken pox (varicella) – shingles. Varicella is predominant during childhood and represents the primary clinic response and the shingles met at adults is the late appearance of the infection. The chicken pox is expressed by discrete general symptoms and a vesicular eruption on skin and on the mucous membrane which appears in rounds. The Herpetic Human Virus 4 (the Epstein Bar Virus) classified in Lymphocryptovirus Gender produces the contagious mono nucleosis often met between the age of 14 and 25. The disease is characterized by an irregular fever, angina, increase of the lymphostones and mono nucleosys.