I have a wonderful 4 month old GSD that is super smart. He is picking up commands really quickly and for the most part he's the perfect puppy. We also have an older, around 9 yrs, boxer. Our boxer is very laid back and very well behaved.
My GSD, Ammo, plays really well with our boxer. They love to run and play in the back yard and spend time laying on the floor together in the living room. They have had a couple very minor scraps. Usually because the Ammo gets on the boxer's nerves.
A few weeks back I took Ammo to my daughter's school for show and tell. Everything was going great, he was being very well behaved, but then another child's parent brought in another puppy. Ammo went crazy! When the puppy ran up to him he barked and growled. He was very vicious sounding. I quickly grabbed him and kept my hand around his muzzle so he wouldn't bite the much smaller puppy.
Any time he is around another dog the same thing happens. He becomes very aggressive acting, no matter the size of the dog. I don't know if he would actually hurt another dog, I've never let him get close enough to find out. I really have no idea where this aggression is coming from, but it has to stop.
The only thing I can think of that would have brought this on is that our neighbor's dogs are constantly fighting and barking on the other side of the fence. Any time one of our dogs walk up to the fence the dogs on the other side usually end up in a fight. Our boxer just ignores the fight and walks away. Ammo usually runs over to me and sits by me.
Can someone please give me some idea of why he is so aggressive acting when he sees other dogs and some idea on how to correct him? I have never had this problem with other dogs and am completely lost on how to fix it.
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