Dogs kept out in the yard can die of the horrible heartworms disease from mosquito bites - now this!!
There are a lot of natural repellants that won't harm a pet & they should be used before ever walking your dog.
From the research I did on heartworms (was deciding whether or not to adopt a dog that tested positive), it’s a very rare affliction, distorted into epidemic proportions in order to sell the very expensive tests, preventatives, and treatments.
Vets sell heartworm preventive pills.