I took my sons guinea pig to the vet because he has a tumer close by the nipple area. The vet said he was sure it was cancer but on the wall of muscle. My question is when we remove it will he chew on that area. I ask because when we had a hamster that had tumors he would chew on the area and passed from infection. Any advice would be helpful. This is our first guinea pig and he will be 4 in august. He is still very active so we want to remove it as soon as possible.