I took my puppy to the vet yesterday to get his last set of shots and our vet recommended we get the Heartworm injection when he gets 6mo old. He said it lasts for 6 months. He Aldo said that FDA just approved an injection that lasts for a full year, but that the pup has to be 1yr old to get it. He told us that Australia has had this drug on the market for 20yrs. Right now we’re doing Advantage Multi once a month. Any thoughts or negative information on doing this? Sorry if this topic has been covered before! I did a search but couldn’t find anything.