does he have a crate? he probably feels insecure, your choices are either to spend the time with him, or if he has a crate find him a favorite toy, and something that smells like mommy(an old t-shirt, towel, anything with her scent on it) and that should help him feel more secure. have her sleep in an old shirt or something and give that to him, but as young as he is he does need attention every couple hours at the very minimum. 8 weeks is really the youngest that they should be seperated from their litter mates, and even then they still get lonely. also, lots of chew toys, at his age he is probably teething. teach him now what is acceptable to chew on to avoid problems later. also remember positive reinforcement. when he does something good he gets happy voice praise with lots of love, and when he does something bad, you have to catch him in the act and show displeasure. stern voice, bad dog, or put a couple coins in a can with lid that makes an unpleasant noise when shaken. they learn quickly and want more than anything to please you and receive love. as far as the aggression, he is at the age where he should be play fighting with litter mates. a good rope toy you can play tug of war with helps and a little gentle "rough and tumble",just watch those sharp little teeth. hope this helps.

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