Leslie, you stop this silly talk, RIGHT NOW!!! This is "us" you're talking to! There isn't a more devoted, loving, responsible furmom than you, Leslie!!! There isn't one among us, I'm sure that hasn't at one time or another, forgotten a heartworm pill or two. I'm sure the pups will be just fine! Stop beating yourself up, friend. You are worrying so much because you ARE such a terrific Mom!! Love, Sandra, Cody and Star***Shine!