I'm interested in how this works in terms of pairing.

I have a lone guinea pig. I had two rescue pigs that were rescued from a bad situation, and one sadly died after 6 months. We've had two separate partners, but despite a lot of work in trying to partner them up he's never been able to not fight a potential cage partner.

I want him to have a partner, but the stress for both of being constantly in fight or flight is concerning. We even considered rehoming at a rescue centre and giving a huge donation, but it would just pass the problem on.