Soooo sad. My heart goes to you.
When my beloved dog died a few years ago, I buried her in my garden. Her name was Fox, sometimes called Foxy or Foxinette depending on the mood. To remember her and honour her, I planted Foxgloves (digitalis purpurea) upon her grave. It seemed a fitting reminder, besides, bees love the flowers. I think it very suitable that you buried your dog in your forest garden.