Saving Heartworm Positive Dogs One Day at a Time|
2021-7-24 · Puppies under 7 months can be started on heartworm prevention without a heartworm test (it takes at least 6 months for a dog to test positive after it has been infected), but should be tested 6 months after your initial visit, tested again 6 months later and yearly after that to ensure they are heartworm-free.
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