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And until you can confirm his sex and neutered status please be very careful to keep him well away from any felamles.
He is able to rreproduce now and it sounds like the place he came form may have been rather economical with the truth.
He is from a lady that has 6 other females and another baby male.
She took on my male guinea pig as well (so we kind of did a swap, no money involved). My guinea pig is a year (not done) and wasn't tolerating any male company. We tried for over a year but he just wasn't mixing.
So we ended up keeping the baby pig we just had (9 weeks old) and re-homing him. Then we got this little one hoping to bond with the 9 week old male we have. So far so good they are much happier.
My older pig is with this lady, and she assures me she's watching him around the 6 females and will separate if during play time he looks like he wants to mate. She said she is going to get him done. Iv seen a video and he's very happy with her girls and just interacting.
I'm just unsure as I read boar pigs can't be neutered with an injection, so unsure what's going on. Luckily my 9 week old is a boy, so no worries with unwanted pregnancies from my end!
I don't usually write like this but PLEASE tell the lady that letting him 'play' with the sows is dangerous. It only takes a second and if she tried to separate them there would be damage to both piggies. He shouldn't be near them at all until six weeks after he's been neutered.
Did you double check the sex of the young one you got? I'm afraid I would. If she thinks you can neuter by injection and that it's okay to put an intact boar with sows then
My guinea pig that went to her is about a year and a half. Iv checked the sex of the little one today and he's definitely male. Tbh the video just shows my guinea pig feeding with them, he doesn't even look interested atm.
And as well as the very obvious pregnancy risk, guinea pigs do not do those kind of playtimes. Putting piggies together is bonding and hierarchy sort out to them which is then abruptly ended when they are separated and put them back in their own cages. This causes a lot of stress to all the piggies involved.
As others have already said this places a huge amount of stress on all the guinea pigs, plus it greatly reduces the chance of your boy being able to happily live with another male.
Mating takes a second - why take such a huge and unnecessary risk?
Plus she told you the boy she gave you was neutered by injection which simply isn't possible.
So I personally wouldn't believe anything she tells you.