For Lyra you may choose Pedigree 100% Vegetarian Food or Drools Vegetarian Puppy food. If Lyra is chewing on garden plants or tree barks, maybe you can opt for interactive toys or chew toys that will keep her active and mentally stimulated. Interactive toys will also help Lyra develop his cognitive functions.
We generally suggest that table scraps should not be fed to dogs as they can be dangerous to the dogs and also lead to obesity. Do not put a muzzle but use a firm "NO" every time Lyra attempts to eat table scraps.
If the problem of constipation persists, we would suggest that you connect with a veterinary who may suggest laxatives for Lyra.
We wish Lyra a speedy recovery!