Yes Xena went through a mouthy stage and she still plays too rough with other dogs and bites too hard. Are you going to neuter him soon? I really recommend it, we had aggression issues with a 4 y/o unaltered male that we adopted from a shelter, he was neutered before coming to our house but he tried to kill our dogs even though they "said" he wasn't dog aggressive....... We had to rehome him and a family friend took him in ...and he killed a cat in their backyard and then attacked their large female pittbull.....so he went to a bull terrier rescue group and we bought a female puppy to raise on our own. It was all very heartbreaking, its a pretty long story but I tried to shorten it. The shelter said they would take him back to euthanize him!!! Even though this was their fault for not properly assessing his behavior. So my brother initially adopted him for 300$, then all his shots and toys and everything was like another 400$ because we used a package deal that is like pet insurance, then he had to pay the rescue 300$ to take him because they didn't have room for him and had to kennel him before he had a home.
...so yea.... he tried to kill our male, neutered pomeranian and that started the re-homing process. So we still loved the breed, he loved people ...but yea we ended up finding a breeder and stuck with a female. But the real problem with the male that we adopted was that he was abused (he would flinch when you flung your arms open to hug him, deathly afraid of the garden hose, etc) , not properly socialized and had aggression issues mainly against small male dogs, which then just manifested when we rehomed him to the family with the larger pitbull mix female ...he was fine with her for 6 months, then they killed the cat together, and then got into a nasty fight with each other, so he went to the rescue and i believe he got into a home with no other dogs or cats. he was very loving and would make a great companion for a human. he really adored my brother. so sad. I do miss him, but my pomeranian has issues now and he HATES Xena. She can be 10 feet away from him and he starts snarling and going haywire. So we still are having issues in our house, and now Xena is signed up for her second round of dog training classes. "puppy school yay" Also....she has become very OCD with tennis balls ...watch out for strange behavior such as tail chasing, I hear that it's one of the worst they can have. Xena just carries her ball everywhere and ALL day. The new game with it now is to drop it in the toilet ........drop it in the sink then not beable to get it out herself, drop it in the pond, drop it in the kiddy pool ....etc. Then you complain about it and bark until you work up your nerve to stick your face in and get it yourself. OR....someone feels bad for you and fishes it out. *SIGH*