Tazo is 7 months and he seems to have no coordination. He can't climb though he used to. If i put him on my shoulder he falls off. He ALWAYS pees on me. He always falls and waits for me to catch him. He's very high-strung When he jumps he flops instead of jumping like my other rat does. could it be the way he's built? He has a small upperbody and a big backside like a spider. But now he has a little bump on his head. what is wrong? also he lives alone because him and my other rat couldn't stop fighting.