excitement? My 4 months old puppy likes to jump up to bite my clothes and bite my hands, and it really hurts! She leave tiny holes on my clothes or sometimes a few cm rip. I tried ignoring her and avoid eye contact like in the dog training book says but she bite my pants and tug it instead. I say no and shove her away but she still jump back up more furious each time. I tried kneeing her in the chest but she also did the same. Please help, I'm at the end of the rope here 