Does my dog need a 4DX test before taking a heartworm preventive? My dog is 71/2 yrs …

Does my dog need a 4DX test before taking a heartworm preventive? My dog is 71/2 yrs old and has been taking Sentinel monthly since he was a pup, and his Lyme vaccination is up to date. I realize the 4DX test is worthwhile and will get it done at the next annual exam. But the vet is refusing to renew the sentinel prescription without a 4DX test, and that doesn’t make sense to me.

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Laura
11 days ago

The 4DX test is the heartworm test, and every vet I’ve used has required it prior to filling heartworm prescription.

Laura
11 days ago
Reply to  Tom

That’s interesting, and best addressed with the vet. It’s possible they simply changed protocol, or maybe they’ve mixed up your normal schedule.