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jackie- should dogs regularly be on heartworm medication if they are in a mosquito plagued area? It's something that they continuously take rather than for a certain period of time as a puppy/young adult?Heartworms are passed by mosquitoes. So a mosquito would have to bite one dog and then the other to pass it. I would be less concerned about getting it directly from the beagle than I would about the fact that you know your dog was exposed to an area with mosquitoes carrying heartworm. If your dog is not on preventative then get it tested and started.
watch out for slugs as they can also carry heartworm .