find a store that sells things for livestock care and get a tube of paste horse wormer called ivermectin (no other kind) and dose him according to his body weight immediately. and again in 3 days. one package should be enough for dosing, how much does he weigh? Get past prejudice because it has been used as an anti-parasite med for 60 years. It can keep him out of the hospital. If he goes in the hosp you will have to smuggle it in to him. This is layman's advice, I am not a doctor. I am using the Ivermectin.