Should I Prune My Modesto Ash Tree?

Q. This is a Modesto or Texas ash tree that was planted 7 or 8 years ago in my lawn.  Do you think if I prune it back this winter that it would grow in to be fuller?  if so, how much should i prune off?

A. For some reason I could not download your pictures but I have a pretty good idea what ash trees look like. In the early years of ash tree I would let them go and not prune them unless these were branches that were crossing, going down, too close together and the like... problem branches. Otherwise let them go and let it grow into its natural form.

Basic limb structure of ash tree in summer and winter.
These are not the readers trees but a much older trees.

Once you start pruning a shade tree and changing its form it can create future pruning problems for you. If you begin to cut them back it may do what you want, create a fuller tree, but at the expense of faster growth. I hope this helps.