My dog keeps biting me
Hi, I really need help with my dog because he won't stop biting me and my parents. Everywhere online it says it's caused by "not enough mental stimulation," but I honestly don't get it because we already do a lot with him. He gets three walks a day, about an hour each, and after every walk we play with him for around 30 minutes. We also do crate training, but he still just won't listen. He's extremely difficult to handle. He pulls very hard on the leash and has already caused my mom to fall because of it. Also he starts pulling extremely hard and starts barking like crazy when another dog passes by. A lot of times when we let him out of the crate, he immediately starts biting aggressively. Sometimes during play, he suddenly has these aggressive episodes where he starts barking and biting us into our hands. It almost feels like it's a game to him. When that happens, we try to get him to put him into the crate so he can calm down, but it's almost impossible. It just turns into a cat and mouse game he just keeps running around, biting our hands, and refusing to settle down. A few weeks ago, we still kept chasing him and eventually noticed it's not worth it he's impossible to catch. So we just wait like an hour till he gives up. A friend of mine who's a trainer told me to put him in the crate whenever he misbehaves, but honestly that doesn't seem to work for my dog at all.
We've already tried several different training techniques, and nothing really seems to be improving his behavior.
sorry I forgot to mention my dog is a 6 month old Doberman.
I already heard that this breed is difficult to handle but I feel like our dog is especially difficult, but maybe I'm the problem.