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: Ensure you select the correct box color based on your dog's current weight (e.g., Yellow for 26–50 lbs, Blue/White for 51–100 lbs).

Most reputable pet pharmacies will contact your vet directly to verify the prescription during checkout. where to buy sentinel for dogs online

: Your vet must test your dog for existing heartworms before writing the prescription, as giving the preventative to an infected dog can be dangerous. : Ensure you select the correct box color