So i have a Guinea Pig named Bogart he is 3 years old and is pretty small, i got him from a local animal rescue. He believe he lost his brother this year as he came into the shelter with him and the brother never exited. We got him about 2 weeks ago and he is not very vocal and just sits in his Pigloo and comes out for food occasionally. So yesterday i went up to the same shelter and found Gunther he is 2 years old and is bigger than Bogart, he has a lot more energy and more vocal. We came home and introduced them since they have to be cleared by a vet before being put up for adoption. So we introduced them and they both tried mounting each other and Bogart came to one of us for protection and ended it about a minute later. I was wondering if you guys had any tips or helpful things that we could do thanks.