I’ve had my guinea pig for 6 years, and he’s always been so happy and energetic when I gave him his veggies; but today he didn’t even flinch when I gave him his favorite...carrots. He bit it, but didn’t actually eat the carrot. He’s also lost a TON of weight. He’s very boney now. And he’s got a growth (inside) that seems to be a tumor of some sort on his bottom right nipple. I’m worried that he may die soon, and I know I should take him to the vet. But I wanted to know if anyone else has had this issue?