I have a question, Lola was given heart guard plus at 6 weeks then the vet gave me another pill to give her 14 days later, so yesterday I was at the vet and they gave me another pill but didnt tell me when to give it to her am I supposed to give it to her 14 days after the second dose or will that be dangerous? Also what are some of the once a month type wormers every one uses? Thanks!