Sorry to hear of your misfortune. I have similar problems with squirrels and chipmunks uprooting seedlings and plants. I know how frustrating it can be to nurture a plant and then see it wither.

I have no experience with Avocado trees, but I have seen other trees send up a new shoot from the trunk when the main trunk dies. That may be what your tree is doing. If the shoot is near the roots, you may eventually have a strong tree from it. Select one sprout and trim off all of the others. Or you may want to just start over with a new seed and use this one to experiment with bonsai.

Your title brought back a memory from long ago. I once told my teacher that the dog ate my homework. The teacher didn't believe my made-up story. She must have seen the TV show that gave the idea to me. I was not destined to be a con-man.

Just let your plant do its own thing, no more cutting until you give it a chance to gain strength and you see what it wants to do. Avocado grow very fast so you won't wait long. Al

You can put something like chicken wire around to keep your dog away from eating your tender plant again. About all it will be good for is looks anyway. My wife seems to love them also but now I have a Mango tree that has frozen back so is of no use as a fruit tree due to the bitterness of fruit from a mango that has died back to the ground but she like to look and seen this tree which has now become a bush with many trunks.