I took four ticks off my dog back, he got a lump a gently squeeze it and got a lot of blood and pus out of it. he drop about 15 lbs, not eating at all, the lump on his back is back and a little bigger, throwing up, laying around sleeping, no energy at all, he seems like he can not jump up on our bed like before. the Vet said to give him a bland diet of rice and hamburger, but he won't eat. what is causing this. I'm worry sick and crying, I don't want to lose my dog. he 6 yr old silver fox rat terrier.