Is it safe to give my dog trifexis without a heart worm test if he…

Is it safe to give my dog trifexis without a heart worm test if he hasn’t taken it since September?

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Kaz Kallin
5 years ago

Heartworm prevention should not be administered if the dogs heartworm status is unknown. Heartworm prevention can be deadly for heartworm positive dogs. Please see your vet about a heartworm test first!