[theBCnut]

Well, they dilute ivermectin down to 1% by adding PG to make Ivomec and that’s supposed to be the purest form that you should use on a dog. I know the texture of Heartgard is really close to those semi-moist foods that are loaded with PG, so I’ve always assumed that’s what is in it. I could be wrong, but if they were proud of their ingredients, they would be bragging about it, not trying to hide it.