New here

[CrosStorm]

Good day to all. I ask for advice from those who know - I've got calm and tame guinea pig (boy)
He's gone crazy, he started biting, he won't let us hold him, he growls, he runs around the cage from us, he jumps on the spot and spins around his axis
We are at a loss. He doesn't even let us pet him. What's wrong with him?
Neither the care nor the attitude towards him has changed

 

[Guinea Pig Papa]

How old is he? How are his eating habits? How long have you had him?

 

[bpatters]

I'd treat him for mites. They can make a pig mighty cranky.