I have 6 yr old Silver Fox Rat Terrier, I took four ticks of his back, they is a lump on his back I squeeze easy got alot of blood and pus out of it, he not eating, drinking water and then he throw's up, he lost fifteen pounds, and he just laying around sleeping. I call the vet, without looking at him she said give him rice and hamburger together. What is causing this I'm worry. He think he in trouble because he throwing up in the house.. I keep talking to him and loving on him that he not in trouble.