I'm am sorta freaking out-Bootsie is doing great on senvelgo and it is so easy. Two days ago, I discovered he has a lump on his lower lip--at first I thought his tongue was hanging out if that gives you an idea how it looks. Any ideas? I see something called rodent ulcers and of course mouth cancers online --both of which look pretty awful. Does anyone on selnvelgo know what happens if they have to surgery? Insulin during surgery and then we can't go back to senvelgo? Can they take antibiotics? Anyone had them on steroids or immunosuppressants? The vet can see him on Tuesday and "we are learning together". I am so afraid I will miss something and hurt bootsie. Not knowing is hard. Any advice?