Thanks For Giving great information. Interceptor is the ONLY safe heartworm prevention medication for Collies, Collie-mixes, Shelties and Sheltie-mixes. This is because Interceptor does not contain the drug ivermectin, which is known to have deadly effects in these and some other breeds. Heartworm prevention is easy.
I didn't know about brushing dog's teeth on a regular basis but will surely do it now after consulting with a dentist. I hope everything is fine because my dog is 3 years and I have never brushed her tooth.