My dog tested heartworm positive. Can I wait to give preventative?

Question

My dog tested positive for heartworm today. However her microfilaria test was negative. In the plan of study my vet gave me it said to administer a heartworm preventative day one, however my prescription cannot be filled until tuesday. Is this an issue? Pet's info: Dog | Mixed Breed | Female | 51 lbs

Megan, DVM, CVA · Accepted Answer

I am so sorry to hear about that. I think it will be fine to wait until Tuesday. A few days likely won't make a difference. I would talk to your vet though and let them to know to ensure they don't want to change their treatment plan any. Every vet clinic does heartworm treatment a little differently. I hope this helps.

My dog tested heartworm positive. Can I wait to give preventative?

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