Thank you all for the continued replies with ideas! I have contacted Washington State University about flea control and they said the only topical that has been tested for use on MDR1 dogs is Bravecto. I am going to stop the Parastar topical, and find another method, and I will be trying these natural ideas. Our local Aussie Rescue recommends Sentinel flavortabs for heartworm control in Aussies, so I will probably switch him to that when his Heartgard is gone. I understand from WSU that any heartworm pills on the market are tested and approved for MDR1 dogs, except those with spinosad, which would be Trifexis. Thank you again, and I will keep watching this thread for more information!
