My dog ate my bonsai!

Hello, this bonsai was recently a victim of my dog… The plant was already struggling a bit with some lack of sun, but since it felt the teeth of the beast (it’s really a puppy) it degenerated quickly. The dog ate some leaves and since the bonsai keeps losing a lot of leaves. Any tips?

You can see how it was in pics in January and how it is now. The “attack” happened one month ago.

More context: first bonsai but had a lot of other plants (indoors and outdoors) before.