you shouldn't keep boars together as they feel stressed and usually fight. it is normal for them. do you have and girl pigs?
With all due respect, your statement is not correct, as over 10 years experience on this forum has shown.
The key to any successful boar bond is character compatibility and mutual liking. Even with unmatched shop boar pairs and too small pet shop cages, more boars than not make it as a pair through puberty. Personality matched boar pairs are pretty much as stable as sow pairs and can be very devoted to each other indeed.
Unfortunately, far too many pet shops and breeders in English speaking countries push the sale of baby boar trios, which are a recipe for disaster indeed once they reach puberty.
It is our aim on this forum to help members from all over the world and from very different backgrounds and often limited options to improve the lives of their guinea pigs in their individual situation and to the best of their local and financial possibilities and options.
Please do not give any advice in our Care sections unless you have personal experience and be careful to ask members about their situation first - especially when demanding neutering operations off-hand, which can cost up to $1000 in this poster's country!
Please also take into account that by far not that all members have got access to an experienced general or an exotics vet or a good standard rescue in the first place before making any sweeping statements and demands. We are a successful forum because we take care to improve welfare and provide support in a practical and not a missionary way and because we respect our individual members' situation.
