Almost 4 month old GS behavior issue
I have 3 months 3 weeks old German Shepherd. When I am at work, I keep him in the crate all day. I let him him out when I get home for the remaining part the evening. Always, he is either in the crate when inside of the house or he is outside playing in the backyard. Lately, it's been really hot outside so I felt bad for him, I let him in the house to see how he is. He get's insane. Runs around like he never been let out of the cage. That is the least of the problem I'm having though. He gets very aggressive. Barking, biting us really hard. The worst is when you sit down, he will bit your legs. He ripped off my jeans the other day. He is barking really loud and at the same time biting me. It's driving me nuts. I want him to run around inside since its super hot outside but I simply cannot put up with his behavior. I don't know why he is doing this. Why is he normal outside, playing, having fun and the minute you let him inside he is completely different dog. I would love for him to get in, play, sit, sleep or whatever, but the biting is one behavior I wont put up with. Any suggestions? ideas? or reasoning behind this annoying behavior?