Originally Posted by
farmerchick
Hello, my collie ate horse manure after I wormed my horse with invermectin and it poisoned him. I ended up with a vet bill just under $900 to save him. This was also with me bringing him home and looking after him with IV and all. I have been told that Invermectin has been used in small doses to treat heart worm in dogs, however dogs that have collie in them and quite possibly some other breeds cannot have invermectin in any shape or form. My advice would be to use a wormer designed to treat worms in dogs.