I don't know how or where I heard of pet bucket but when I researched I decided to give it a try. My first order 12 months of Heart guard plus and Advantix arrived in 10 days. The expiration date was 19 months away and the cost savings was fantastic. I told my neighbor who was buying Simparica from his vet every month about PB and he is now getting his order for less than 1/2 of what he was paying. No prescription required but be sure your pup has been checked for heartworm every year. You may not get your order as fast as I did, probably should allow 20 days to be safe. Pet bucket, I give you 5 stars.