So as some of you may know, we rescued a GSD from our local shelter a couple days before he was going to PTS. He's very skinny, beat up looking, and listless. It came as no real surprise that he's HW positive. However, I've never actually had a dog who was HW positive. The vet went over a bunch of stuff with me- he was started on Heartguard yesterday to start killing off the baby heartworms, he was put on doxycycline to help clear up whatever is causing diarhea, and he goes in next Thursday to get his bloodwork done and to schedule his first injection. I know he has to stay pretty much absolutely still following the injections so large clumps of heartworms don't fall off at a time, but does anyone have any other advice?