Lori
New member
I've had my dogs on Sentinel for years with good luck. It worked out well when I got my Aussie mix Sydney. I haven't had her tested for the MDR1 gene since I could get Sentinel. I've heard its supposed to be back in production but am looking for an alternative. Anyone else have an Aussie, Collie or other Ivermectin sensitive breed? What do you use for heartworm prevention?