What kind of tree is it? (My husband the landscaper wants to know) Is it a maple? (which would make sense)
There are these tree guard things that you can get to enclose the tree so the dog can't get to it. We've used them on young trees to protect them from nutty dogs digging them up, running into them and using them as spring poles. I'll have to call the landscape supply store to find out what they're called.
If you post a picture of the tree and where the sap is coming from - Mark can figure out what to do, then I'll post it for you.
Moral courage is the most valuable and usually the most absent characteristic in men ~ General George S. Patton, Jr.
She taking all the stars down from her sky to hang them up someplace new, where there's better weather and the sky's a different blue. ~ Autumn Fields