I’m sorry to hear this.
At four months old hormones start to rise and that is when any differences and incompatibilities can come to light. If they both want to be dominant then neither will back down and they can’t remain together.
You ride out dominance (chasing, mounting, rumbling) but is a line at which it stops being dominance. The fact you’ve said furball and have found some injuries you need to be prepared that things may not be good between them and actually it may already have gone too far.
It’s sad when bonds break but it is one is the issues in getting piggies as babies - they are ok as babies but once they become teens they can decide their bond doesn’t work.
A new cage can be the catalyst for a bond break but only if there are underlying issues between them anyway.
Reintroduction is not recommended where there has been a fight and it is only likely to happen again. Fights only happen when they can’t make things work.
If you do decide to try to reunite, then you must do it in neutral territory. Do not reintroduce by just putting them back into either of the two cages they are in now.
Put them on neutral territory. If all goes well, aside from normal dominance, then they can remain in neutral for several hours. During that time you need to transfer scent of both piggies into the cage by wiping soiled bedding into the cage.
If their don’t have compatibility and don’t want to be together, then things will not be ok in neutral territory. There will be an escalation in behaviour and possibly a fight. If that happens then it is clear that their bond is sadly over. They will need to move back to separate cages. Unfortunately that is then a permanent arrangement. They will need to remain separated but side by side for life.
I know it’s sad. I’ve been there myself with one of my pairs. I took the risk and rehomed a pair of babies. They were with me for 9 weeks, hit 18 weeks old and then had a huge fight. Theyve lived side by side for almost two years now. One of them has just recently been bonded to one of my other bereaved boars.
Please read the guides below before you do anything as they explain more. They explain what behaviours you want and what you don’t and whether you should attempt to reintroduce at all based on what you have seen so far.
We can only advise based on what you have said and you’ve said a few things which would be raising alarm bells for me.
Let us know how things go
1 Causes for bonds to fall apart
2 Bonds in Crisis
- What are the signs of a dysfunctional bond?
- Bullying
- How can I test whether a bond is no longer working?
3 Failed bonds and what next?
- What to do if my piggies have had a major fight?
- When rebonding doesn't work out
1 Causes for bonds to fall apart
Every fall-out has of course its own...
1 Introduction
2 Pre-bonding
- Quarantine and sexing
- The need for a plan B
- The rule-breaker: Youngsters under 4 months (sub-teenage)
3 Setting up an introduction
- Getting to know each other
- ‘Buddy baths’ – why not
- Scent swapping - why not
- Setting up a neutral bonding area
- How to start the bonding
4 Acceptance phase: Do we like...
1 The hormonal teenage months
- What are the most difficult times?
- What are your boars' chances of making it together?
- What can help to boost your boys' chances?
- What does NOT work?
2 Fighting, bullying and when to separate
- What are the signs of a dysfunctional bond?
- How can I test whether a bond is no longer working?
- What to do if your boars had a bloody fight?
3 Life after...
1 List of dominance behaviours in ascending order of aggression
2 What may cause this type of behaviour in boars?
3 When do you see these behaviours in sows?
4 What can trigger fall-outs?
5 Further helpful guide links
I thought it may be handy to have a sticky on typical dominance behaviours for a reference - hopefully it may help humans understand guinea pigs and their behaviour a bit more and hopefully prevent some avoidable problems!
1 List of dominance behaviours...