A few weeks ago a question about where dogs are not allowed in the Catalinas prompted me to research this topic. The only Forest Service link I could on this topic was this one:
Where it says that "Dogs are prohibited, except seeing-eye dogs or handi-dogs in the Bighorn Sheep Management Area portion of the Pusch Ridge Wilderness."
So I went to look for a map or definition of the boundaries of the "Bighorn Sheep Management Area portion of the Pusch Ridge Wilderness." The only thing I could find was this:
Update 2011-06-12: I managed to find a PDF of the actual closure order online (not sure how long it will stay there):
The closure order contains a map which seems to track the map given above.