My Guinea pig has developed a crusty bit of fur on his back ... I'm not sure if it's fungal or just from the heat (currently we've got a heat wave in the UK). Never happened before and his behaviour is unchanged. Perhaps he's a bit grumpier than usual snapping at the other pigs but that could just be confirmation bias from me. I've attached pictures, can anyone help?
I don't think it's causing pain or discomfort but can't be sure.
I don't think it's causing pain or discomfort but can't be sure.