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
6 months ago

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

Laura
6 months 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.