Wow, thanks for posting the chart. My vet just said Friday he thought we should give Frosty the injection. I'm going to print this and take it to him.
Frosty has been off heartworm med. since last November because he almost died after taking his routine (had it since puppyhood) Heartquard Plus. He's now 12 yrs. old and has always had Heartguard, but when I gave it to him in Nov. about 4 hrs. later he became very ill. He was going into shock at about 4 AM I had to take him to the doggie ER. He was there on intravinous fluids and drugs for 36 hours. I can't prove it was the Heartguard, but it was the only thing he had contact with that could make him so ill. So we haven't given him any heartworm meds since, but are thinking that in the summer we should give him something. For some reason my vet doesn't like Interceptor, he said something about too many combination drugs. Here in my county in Western Oregon we don't have a heartworm problem, but we do go camping other places in the summer.
Dee