I'm not sure if this is the right area to post it but just let me know!

[Newguineaowner]

So, it's my first time owning a guinea pig, and while I love him it's so very new owning one! My brother and I got our guinea pigs around the same time which was probably late January or towards the middle of February but then a few wees afterwards my sister got a guinea pig of her own that she added to their rather large cage. I just need to know if something is wrong or I'm doing something wrong but I've noticed that they are mounting one another a lot (They're all boys) and I just need to know if I'm doing something wrong because I just am not very knowledgeable about this kind of thing. I'm learning and looking up more information on the right things I will be buying them but I'm just so scared that I'm doing something wrong.

 

[Piggies&buns]

Welcome to the forum

If thats three male piggies together, then I am afraid you will most likely need to separate them. Boars need to be kept in pairs only as it’s incredibly difficult to keep three male piggies in the same cage (it’s only sows who can be kept in groups with or without a neutered boar). While mounting and dominance behaviours are normal between piggies and normal between a boar pair, three boars together almost never works out for long term (most boar trios won’t make it much into their teens (16 weeks of age onwards and certainly very few ever make it to adulthood together) . Its hard to get the balance of characters right in a boar trio so they don’t tend to form a functioning hierarchy - for a boar pair to work, one needs to be dominant and the other submissive, in a trio this match doesn’t generally work properly as what normally happens is two end up wanting to be dominant and then they will fight. At worst it can break all bonds and you then end up with three single piggies.

If you do have three boars together then please find out which two get on best and separate them into a cage of their own. The piggy who ends up single needs to be kept in a separate cage and never have physical contact with the pair. The single piggy’s cage needs to be along side the pair so they can interact through the bars only so he doesn’t get lonely. In the long term, the single piggy could do with a friend of his own.

Two boars together need a cage measuring 180x60cm as they are territorial and need more space.

You also cannot just put a guinea pig into the cage belonging to other piggies as that can be seen as a territory invasion and also cause fights. Any introduction between two new piggies needs to be done on neutral territory following a specific bonding procedure.

Once you have separated them, then two boars together will always have displays of dominance, you will see mounting and chasing etc particularly if yours are coming up to or within their teens (which is from 16 weeks until 14 months of age).

I’ll add in some guides below which give you more information

A Comprehensive Guide to Guinea Pig Boars
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
Boars: Teenage, Bullying, Fighting, Fall-outs And What Next?
Dominance Behaviours In Guinea Pigs
Bonding and Interaction: Illustrated social behaviours and bonding dynamics