[Mom to Hot Rod]

I think that Maggie may have eaten 2 doses of Interceptor heartworm meds. I gave each of them a pill in some cheese they ate it, I thought. I then finished giving them the rest of the cheese and then I saw Maggie picking up a pill and before I could grab it, she chewed it up! I am thinking it was Hot Rod's pill cause he has picked it out of whatever I put it in before. Any one know if this will harm Maggie? And what should I do about Hot Rod's dosage? Thanks in advance.