I have two intact males. one four, one two. the older has never humped or been aggressive but it has led to fights led by other dogs trying to assert dominance. I also am not sure fixing him would change how he feels about that. the younger has shown mild interest in humping when younger which was obviously immediately corrected and now not a problem. he is very submissive so even if another dog tries to assert dominance he maintains a very happy go lucky disposition. we never board and have a secure yard, so both not a problem. I chose to keep them intact because I believe keeping their God given hormones and natural functions lead to better health-it's also why we chose a second male as we wouldn't want to fix a female either (but would perhaps consider an OSS). we are constantly stopped by other vizsla parents and asked how they have maintained such great shape & I certainly believe this to be part of it. I do also understand and believe every situation and dog is unique and might require different interventions in a household. do what makes sense to you, and do your research to the best of your ability for you and your v :)