Hi and welcome!
I am very sorry! It must have been such a bad shock for you! Both boys of yours are still in the very tricky, hormonal period, which lasts in spikes from 4-14 months. it doesn't take much, like a restriction of space or new territory to trigger a fight. Generally, piggies won't go back together after a serious fight with bites to the face and rump (which has sadly happened in your case). You were right to separate. I am sure that your poor youngster will be totally upset!
Your options for your two single boys are:
- Boar dating each boy under expert supervision at a good rescue for a new suitable mate, taking character compatibility and preferably a good age gap into account. By dating at one of our recommended good standard rescues, you minimise the risks of further fall-outs and maximise the chances of finding the right boarmate. You also have the rescue to fall back on if things go wrong down the line.
Here is our recommended rescues locator:
http://www.theguineapigforum.co.uk/pages/guinea-pig-rescue-locator/
- Neutering in order to be bonded with a sow each. With guinea pigs, neutering only removes the ability to make babies, it won't mend their bond, unfortunately.
However, you will need to look for a vet with a very good track record in piggy neutering, as otherwise the risk of post op complications, especially abscesses, is quite common. You also need to factor in a full 6 weeks post op wait until a boar is 100% safe to live with a sow. I have the surprise baby from a supposedly safe over 5 weeks post op boy living with me, just to prove that particular point!
That said, cross gender bonds are the most stable of all piggy bonds. Fall-outs are virtually unheard of. Again, I would recommend dating at one of our recommended rescues for mutual liking and a loving partnership - living with a "sowfe" who accepts him during the introduction is every boar's dream come true.
We have got a piggy savvy vets locator, but if you can travel as far as Northampton, depending on where in Oxfordshire you are, Simon Maddock at the Cat&Rabbit Clinic has as close to a 100% success rate as any surgeon can reasonably get.
http://www.theguineapigforum.co.uk/pages/guinea-pig-vet-locator/
http://www.catandrabbit.co.uk/html/contact_us.html
- Living next to each other with interaction through bars/mesh. Not ideal, but a solution if neither of the above is an option for you and you cannot double the number of your guinea pigs.