Ask a Dog Vet and Get Answers to Your Dog Veterinary Questions
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Do you mind me asking what part of the country you live in?
How long have you been using the comfortis instead of the heartworm prevention?
In general, once a dog has been bitten by an infected mosquito, it takes 5-7 months for the infection to develop into the adult worms that we an detect with testing. Signs and symptoms of heartworm disease can include coughing, lethargy, loss of appetite, exercise intolerance or difficulty breathing. These symptoms would generally not be observed until at least 6 months after infection. I would recommend that if you pet has not been on heartworm prevention, and it has been at least 6 months from the last dose, to go ahead and have a heartworm test performed. It sounds like you have started back on monthly prevention, so I would also recommend having an additional heartworm test performed in 6 months.
Depending on what part of the country you live in, the risks of contracting heartworm diease are different.
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