When I moved into my new house there was a lovely lilac tree (approx 10ft tall) at the bottom of the garden. I have since bought a dog that used to urinate near the tree...I didnt thank this would cause the tree a probem but it stopped flowering and leafing almost immediately. I have since stopped the dog urinating on the garden but the tree does not seem to be recovering (it's been almost a year now since I stopped the dog going to the loo on the garden).
The branches are still green inside although the edges are starting to dry up and die. Is there anything can do to save my tree from dying?