I neutered my boy at age 6 due to prostate infections. So keeping your boy intact means that you should also monitor him as he ages for any reproductive issues. I found out Riot had an infection on collecting him for breeding and his sperm count was zero. We sent the semen out for testing and it was found to be a prostate infection, after fighting the infections for awhile, we gave up. Like keeping a girl intact, you do have to be aware of pyometra. Reproductive organ infections are something to know about and know the symptoms of. Riot acted like he had huge hip problems. Once the infection was treated, that symptom went away.