The concern is using Comfortis with mega doses of Ivermectin. Heartgard, Iverhard, etc. probably don't contain enough Ivermectin to do any harm when given as a heartworm medication. To be very safe, I'd go with Interceptor.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |