Will answer the questions i can
1. Neutering DOES NOT have any affect on the dogs behaviour i.e calms a more hyper dog down? True or False? - Don't see how this works, in my experience there are other reasons for a dog to be hyper (food, lack of exercise, etc).
2. Neutering DOES NOT make the dog want to run off and HUMP the girls any less? True or False? Taz was neutered at 7 months and has NEVER been interested in humping girls (other than occasional when gets excited through play). I was told that humping is a learned behaviour, so if they hump before neutering it is highly likely that they will continue to hump afterwards - this is a training issue.
3. Its a Myth that Neutering has any affect on the dog other than him not being able to reproduce? True or False? No idea. Taz's coat is fluffy on his legs, but always has been.
(the above are statements from OH)
My questions are:
Are there health benefits to neutering a young healthy male (no man part issues with retained testicles or anything)? Reduced risk of testicular cancer.
If not breeding and no issues with behaviour etc is there any positive to neutering (except for the reproduction part) Reduced risk of testicular cancer and can see that it would reduce frustration if bitches are on heat (but don't have experience of this)
Is there an age that is recommended to neuter i.e when older dog to avoid health issues? ask 20 people, you will get 20 different answers.
Bearing in mind that you have had issues with Diesel when you had Riley, i would probably speak to a behaviourist before you get him done, just in case it affects his behaviour negatively - i dont have any experience of this so wouldnt like to say go ahead without professional advice.
Just on the coat issue, Taz's torso is very silky and easy to maintain, its just his legs that are fluffy