dbol, anadrol and halo are all very liver toxic oral steroids. Your liver is a very hearty organ and can take a beating but that doesn't mean you should abuse it.
I see no problems with including a 4-6 week kick start of anadrol/dbol in a steroid cycle if you have no pre-existing liver issues and use a good liver aid supplement while running the orals.
Look for a liver aid supplement that contains TUDCA, NAC and milk thistle. I really like the product n2guard from n2bm.com