My yorkie rescue had heart worms. My vet put her on an antibiotic for a month and prednisone. Then he gave her an injection on morning and the second injection the next morning. He was still on prednisone. I had to keep him quiet for a month especially while the worms are dying and traveling. No running, I walked him out on a lease where he couldn’t run. He didn’t have to have another injection a month later because he didn’t have the big ones or small(can’t remember which) He is fine now but I keep him on heart worm preventive year round because I live in South Ga and we have mosquitoes year round. Good luck!
