Hardly a problem for your situation Steve, but they do seem to attract the attention of deer too. A nurseryman friend of mine had his deer fencing breached a couple of times. He had a row of about 30 wild service trees which are now about 6 years old. Nearly all of them had their bark surface marked, fortunately not ring barked. I managed to get one which escaped the deers attention to use as a standard for a hedge I've just finished planting.
It has quite a lean to it so I am considering trying to persuade it to grow more upright with a webbing strap attached to the end post.