Recently moved to Colorado.. And just made out first trip to our new vets (they were SO impressed with how beautiful the boys pearly white teeth were.. Thank you raw. Also heart worm came up. She recommended heart guard. Which from what I have read is one of the safest options when it comes to meds. I just want to know my other options. What is the most natural heart worm preventative. I don't like over vaccinating or giving in necessary medicine. Yet I am fully aware that heart worm is a serious matter. Any advice would be much appreciated!! Thanks so much everyone. Hope you are all enjoying the beginning of summer!!