Younger Guinea pig turned aggressive?

staarz88

New member
I have 2 male guinea pigs. The older one whom I got first has been the dominating one. He used to scare the younger one at first to show his dominance I guess. But after 2 years of having them, the younger one has all of a sudden become aggressive. He runs after the older one to bite him (I saw a couple wounds and patches of hair on the floor that he bit) and also humps him.

He has been biting me too whenever I try to pick him up. I have kept him in isolation (seperate cage) for 2 weeks and still no results. He is still as aggressive. The older GP is now extremely terrified, he would not even go near where the younger one is. What can I do?
 
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