<span style="color: #3333FF"> I have experience with it. My foster was given the doxy for a tick borne disease (ehlichiosis) Then we discovered he was also HW+. He was on the doxy almost a month before his HW treatments began. IMO, the doxy made his treatments so much easier. He had NO coughing or side effects. This was one sick dog who had every worm, the ehlichiosis,vomiting,diarhea, and a respiratory problem and was so thin, the Vet had a hard time finding an injection site.
I avoided the diarhea with the doxy by giving him plain yogurt, 2 hours after his anti-biotic.
Hope that helps!</span>