Hi! So, what prompted them to begin checking his liver levels? How old is he? This article is pretty informative regarding liver enzyme levels and our fur friends. https://www.dvm360.com/view/canine-liver-enzymes-so-many-questions One of the things they state in the article is that it can be hard to determine how aggressive to look into and treat the issue. Such as if a biopsy is worth it. Sometimes, these elevated levels can be for benign reasons (if the dog is older especially). Tell us a little more and we'll chat about this!