I've been giving my 10 month old GSD Trifexis for about three months since he finished his vaccines and vet administered heart worm meds. I just realized today he's most likely throw up at least the last two doses. I'm concerned what risk 2-3 months without proper heart worm prevention poses. I have an appointment with the vet in the morning but since I'm at work until then I have plenty of time to worry about it. I figure ill have a heart worm test, switch to something topical, and hope for the best. Anyone have experience with the subject? How worried do I need to be?
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