The first week

The first week after your pet passes away make yourself a memory box. I found that this helped quite a bit with the grieving process. You can either make a box, buy a box or what I did was since I had a rabbit I used a box that was his favorite. Fill it with the pet's things. This can be toys, samples of his/her favorite food, treats, written pieces, whatever. And don't think that just because your pet is no longer with you in his/her body you can't write letters to your pet. You can constantly add to your memory box. Make sure you keep it in a safe place.