Hi John,
I buy mine at my vet, but they have a great price and card what I want, so I’m lucky. Last time I took my two in for a check-up, I ended up winning a six month supply box for one of my dogs. I was so happy!
I have read that there are guidelines regarding heartworm preventatives. If you don’t buy it from certain places, and administer as prescribed, and your dog ends up with heartworms, you won’t be covered under their warranty. Just something for you to check into before you place an order.
My integrative medicine vet, whom I always see for wellness, uses Sentinel Spectrum for her own dogs and recommended it for mine as well.
