I’m sorry to hear about your boar.
It would not really be advisable to have three in a 2x4. A 2x5 is needed for three.
What you don’t want is to run into bond issues due to space because changing the cage size later would be too late to save a bond. Plus changing cage size will cause them to need to reestablish their relationship anyway.
Do note that trying to bond three sows all of a similar age could run into problems.
If you were to adopt an already bonded pair of adult sows and try to bond them with your sow, then there is a chance of hierarchy issues - a bonding between a single adult and bonded adult pair is unfortunately one of the harder bondings to get to work - it can work but you would need to have a plan for it not to.
Your sow would have to be fully willing to give up all dominance and to be at the bottom of the hierarchy so that the hierarchy between the already bonded pair was not disrupted or impacted in any way. If your existing sow and the dominant in the pair don’t agree, then the bond will fail.
Ideally when bonding sows in this situation, you would need to get two younger (baby) sows so that there is not a disruption, your sow can be the dominant and the babies happy to have a leader.
As the best/safest way to try to achieve an adult trio would be with the assistance of dating at a rescue centre. But it would mean that they would need to know your cage size is appropriate before approving any adoption.
If you took on two adult already bonded sows without dating at a rescue, then you would need to have a plan in case of the bonding failing.
That would be a pair lives in one cage, and your sow lives separated but side by side with the pair.
If you were to get two other sows who were unknown to each other and then try to bond all three then there would need to be the back up plan for all three to live as singles side by side if all bondings failed.
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
