Abstract: In this study, they were used 7 dog of different race, age, size and weight to value the effect of the castration not have more than enough behaviors wanted in mature dogs with proprietor. The surgeries were carried out during one month, in clinical of the city of Mexico. A questionnaire was applied before the surgery: Does it leave to the street their dog?: alone, with somebody, c/s belt, does Their dog behave aggressive with other dogs?: no, sometimes, very frequent; Is their dog alone or does he cohabit with other dogs?: is it alone, do I have more dogs; How does their dog behave when you see a female?: does he smell it, does he bark him, does it mount it, does it attack her, doesn`t he take it into account, is it submissive; Had noticed that their dog mounts other dogs, objects or people?: yes, not. After the surgery: The anxiety of the dog to leave to the street increase or do I diminish?: did it increase, did it diminish, does it continue equally; Is it aggressive with other dogs or people?: no longer, does it continue aggressive, now it is aggressive; How does their dog behave when you see a female?: does he Have interest, doesn`t he pay him attention; Does their dog continue mounting other dogs, objects or people?: yes, not; Does their dog continue marking with urine some parts of his house?: yes, not. The surveys carried out before the surgery, determined that 6 dogs presented inadequate sexual behavior, 5 had behavior of territorial marking inside the house and aggressiveness toward people y/o dogs and for travelling, it was observed 5 of them. One month after the surgery; 66% modified the behavior of sexual desire, 40% diminished the behavior of territorial marking, the aggressiveness it didn`t present effect and the travelling it was presented in 40% of the animals. The castration, it can be an effective treatment for some behaviors problem; however, it is necessary to value the long term adverse effects.
Alejandro Cordova-Izquierdo , Mary Silvia Cordova-Jimenez , Silvia D. Pena Betancourt , Cristian Alejandro Cordova-Jimenez , Saul Cortes Suarez , Jorge A. Saltijeral Oaxaca , Gustavo Ruiz Lang and Victor M. Xolalpa Campos , 2006. Effect of the Castration on Not Wanted Behaviours in Dogs. Journal of Animal and Veterinary Advances, 5: 970-974.