A dog used as stud, it's not unusual for his personality to change at least somewhat. The tendency to mark their territory indoors and out is normal trait of an unneutered male (whether you use him as a stud or not its what an intact male does). Once a male has begun marking its a very difficult habit to break, so if in the case youre only thinking of one mating youve changed him most likely for life.
Your little man will be more apt to wander in search of in season bitches if not well contained (total fenced area).
Once a dog has mated his first bitch he will want more and more and more! Intact males have only one thing on their minds SEX (not unlike a young teen human male) once theyve discovered sex theres no going back. Then there is sexual competitiveness, where as a once passive male most likely will become more aggressive around other male dogs.
__________________ Kimberly |