My little guy, (17 week old beagle), was tested positive for Roundworms on Friday and was given Drontal Plus dewormer. He took 2 pills on Saturday and takes another 2 in 3 weeks. I also had purchased Advantix for him a week before since he ended up getting fleas from someone's house but have yet to use it. I wasn't sure if it was OK to use the 2 together as I don't want to overload his system with too much within a short period of time (he also just had his 16 weeks shots a week ago Saturday). Does anyone know if giving him the Advantix now will be a bit too much for his little body or should I wait? I have done what I can to get the flea issue under control by bathing him and rinsing in vinegar, regularly washing all bedding where he sleeps and cleaning floors etc but I'm just not entirely sure they are completely gone yet.