So sorry for your loss. Even knowing that our pets lives are short it doesn't seem to really be any easier to deal with the grief, but you are most definitely allowed the grief. I think for the pets, suddenly is the way to go but it is so hard on the humans. You already know the happy memories so outweigh the past week. Over the years and many pets I've learned that you never forget the good ones and even the bad ones seem better in hindsight. But the initial loss is heartbreaking and you have my virtual hug.