Neutering or spaying a dog does eventually make them less aggressive, yes, when their body stops producing too much testosterone. Neutered or spayed animals also have a longer life expectancy.
if you neuter or spay the dog, some dogs are calmer some aren't. It all depends on their temperament
Not necessarily. They will still be aggressive to other animals because of their territory and they may not stop being aggressive.
It actually should be less aggressive, but if it is an older dog it will probably remember more than it would if it was young.
A Boxer is the most harmless dog in the world... They rarely bite or get aggressive. The only downfall with them is that they like to sit in everything.
You can make your dog to be aggressive towards other dogs by training them.
Snarling and growling
If you are asking how to make your dog aggressive, it may need to be trained as an attack dog.
Play agressive..
no maybe but always yes
Bad Idea.... If you try to show your dog aggressiveness, it would generally become afraid. Plus, who wants an aggressive dog? Don't try to make a dog aggressive. It will become dog fights and might end up getting it (probably "him") killed.
No. But no meat will make you dog very unhealthy.
Well. if your dog is aggressive to some dogs and not to others there are many reasons. First, the dog(s) your dog is aggressive to may be territorial aggressive, meaning that if you live near them then your neighbor's dog may think that the whole street is his territory and your dog is intruding, causing fights and barking. Also it could be something wrong with your dog. There are diseases that can make a dog too territorial aggressive and it can become a big problem. You should talk to your vet if your dog is too aggressive. And one last reason is your dog can have rabies. If your dog doesn't ahve his/her rabies shots then go to your local vet and have your dog vaccinated. I hope I helped with your problem! :D