I am thinking it is some type of local (to your area) med for animals. Were ever you pick it up from? What area? Thats how I would trace it back. Looks to be 1870's with the deep mold panels in the bottle.
Just realized I hadn't looked.in my Delaware medicine list and I found a E.T. Dillworth bottle from Wilmington Delaware in there. Funny because its spelled with 2- LL's just like I misspelled it. I'm guessing this is a Delaware bottle. Will have to do some more research.