Interceptor update: There is still no expected date for Interceptor to be back in production. For those who are concerned about use of alternative products such as Heartgard, please visit this helpful link. Ivermectin-based heartworm preventatives are safe even for pets with the MDR-1 gene mutation, but if you'd like to know whether your pet carries the MDR-1 gene mutation, you can send a cheek swab sample to Washington State University. Please ask me if you have any questions.

http://www.vetmed.wsu.edu/depts-VCPL/test.aspx