Hello there guys, I am new here and I have an APBT at 10 months old named Dimebag. Here's where I need your help.
He has been showing aggression towards my friends lately and I think it is quite serious. I don't know if it is okay for a puppy to bark and jump and bite on clothes of a stranger, but he did that to my friends. I couldn't control him. Behind the locked gates, he kept bashing on the gates wanting to "attack" my friends who stands on the other side of the gates. I leashed him and tried to bring him closer to my friends. Along the way I gave him commands like sit and stay repetitively. He obeyed but as soon as I say okay or the treats are finished, he scamper and lounges towards my friends. He even tried to climb on my friends who remained calm. I quickly snapped on his leash before he could go any further afraid he would really bite them.
An accident happened when he was on the leash, and my friend suddenly panicked when a vase fell off and broke. My dog diverted his attention towards my friend and ran over to him and bit off his clothes. During the "attack", he seemed to pull back a little and instead of biting real hard, he kinda nipped the clothes. But later, he continues to bark and jump again like crazy.
My friends tried to feed him treats and give him belly rubs, but he wouldn't let my friends anywhere near him. Whenever they approach, he stood his ground as if ready for battle.
Days before, I introduced a friend of mine to him outside of my house. He growls a little bit because my friend was holding a puppy. But I snapped on his leash and then he was okay with him as well as the puppy. He even showed love towards the puppy. Played with her and cuddled her. It was easier than the aggression at home. He also got along well with my friend's parents when introduced outside of the house.
Another incident happened in the house when one of my friend got his pants ripped by my dog. My dog doesn't seem too angry or furious at him but he bit his pants into pieces.
I tried another method. I had my friends standing close behind me and walking around the house. I leashed my dog and whenever he sits or stays or as long as he doesn't pull or bark, I treat him and praise him many many times. Soon, the barking and jumping towards my friends got lesser and lesser. Still, that was for one day's work. I hope he doesn't forget that tomorrow.
I also realise that he barks less after exercising. But he still does it!
I hope you guys could advice me on my dog's behaviour. I wonder if it is normal for a 10 months young puppy.