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Probably not. Viagra is not as commonly used in dogs because it is so much more expensive than other readily available veterinary drugs. Vetmedin (pemobendin), enalapril, and Viagra (sildenafil) are all cardiac drugs but they all work a little differently. Usually we start dogs on enalapril because it is the cheapest option we have, but we do pull out the vetmedin for serious heart disease. The vet I work for has never used viagra in dogs, but I have heard of it. Maybe talk to your vet about other, less expensive options or generics. Your vet wants to help you keep your dog as healthy as possible (if they are any good that is), and they know that clients aren't going to give a medication (or worse yet, give it improperly in an effort to stretch the prescription farther) if they can't afford it so most vets are willing to work with you to come up with a treatment plan that you can stick to for the long run.