so you have three boars together is that correct?
then this is why they are fighting. You cannot keep three males together. three boars almost always ends in fights. The space required to attempt a boar trio is huge - they need a cage of three square metres which most people can’t offer And even then if they aren’t character compatible (which is hard to get right in a trio) then they will still fight. If you do have a trio, then keep the two which get on best together and one will have to stay on his own from now onwards. Keep him in a separate cage so he can talk to the others through the bars, but please don’t put them back together as it will cause fights.
If you already had two and then added a new baby, it can ruin the bond between the original two as well as the new baby not be accepted. So you run the risk of all three ending up single.
If the single piggy is to remain single, will need a cage of 120cm x 60cm. The pair will need a cage of 180cm x 60cm.
if you decide to get the single piggy a new friend of his own, then he will also need a 180cm cage. You need to go about finding a new friend the right way, via dating at a rescue centre if possible. Character compatibility is key to a successful bond so if you have the option of dating then it means your piggy chooses his own new friend which will result in a better bond. Buying a piggy from a pet shop has risks as you don’t know if they would be compatible and they may not like each other meaning the new piggy would also need to be kept in a separate cage.
Did you check the sex of the new baby yourself? Accidentally bringing home a missexed piggy and putting a female in with two boars would also cause them to fight.
If I’ve misread and it is two piggies -
how long have they been together?
what is actually happening?
did you bond them together yourself?
how big is their cage?
Character compatibility is the key to a successful relationship. If the younger one is coming into his teens and now has his own ideas on dominance then If they aren’t character compatible then this can mean their relationship will fail.
if it is just dominance behaviours, then you need to leave them to establish their relationship.
if they are having full on fights, then their relationship is over and they must not live together any more.
A Comprehensive Guide to Guinea Pig Boars
Boars: Teenage, Bullying, Fighting, Fall-outs And What Next?
Dominance Behaviours In Guinea Pigs
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
Bonds In Trouble