I want to say milk thistle. This is what was recommended to me for my dogs after they take their heartworm medicine. I was told it was to support the liver.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD