All I can tell you is that my puppy contract required heartworm preventitive for the life of the dog, as it's the responsible thing to do for the dogs. Anyone who didn't want to give the preventitive to their dogs were welcomed to find another breeder. And no, I don't sell the preventitives and didn't care which brand they used as long as they used it.
I don't want any of my dogs ever having to deal with health issues caused by being forced to live with a parasite load of any kind.
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