My Basset Jack has been lethargic for the past three days. He seems a little better today, but On Saturday and Sunday he was quiet, and not his usual self. Jack wasn't interested in plaing with his sister, Basset Maggie, and kept to himself. Usually he's right under my feet. He ate a little but not with his usual enthusiasm. He also had long, mucousy strands of drool that I had to wipe off a few times. ( He hadn't been playing or exerting himself) At first I thought it might be the wet, humid weather, but then I started thinking about his heartworm and tick medicine. I put Frontline on on Sunday, Oct. 2 and gave him his Heartworm pill on Tuesday, Oct. 4. He as his usual,active self up until Saturday, Oct. 8. I live in an area with a high tick population. If I didn't I wouldn't use Frontline. Could these medications, Heartgard and Frontline, be making him sick? I've only noticed him a little listless after the medications about six months ago. Since then he always has been fine. Any thoughts or ideas? Anyone have any suggestions for alternatives? Would the twice a year vaccine for heartworm be better? Thanks