My chocolate lab was a rescue dog. I took her to the vet for spaying and various shots and pills.A week later she lost all her hair. I mean she was a mexican hairless, and scratching all the time. She was tested for both manges..negative. put on special shampoo and diet nothing. I forgot to give her her second dose of heartworm medicine and her hair started to grow back i have not given her her heart medicine and $4,000 later she's fine.Will garlic work for heart worms, I now have a black lab puppy i am giving garlic to for worms.