The vet says she looks great. He gave her a 12-month ProHeart, and I will never use Heartgard or any of the other products again. She whimpered a little when she got the injection, but that is the only side effect. The vet said the needle is larger than the other needles they use. She goes bak in five months for a heartworm check . Praying she will be clear. I plan to call Heartgard and let them know how disappointed I am with their product.