Pet bereavement support
There are many books covering bereavement, and also covering pet bereavement specifically. I’ve personally found that books can offer some comfort, but that it does depend on the book and how it is written, and what the views are of the author (as with websites, counsellors and everything else offering some sort of support !) – so it’s a very individual thing as to whether you will get comfort from whatever you chose to read.
However, there are books available, and here are some of them – I’m not endorsing any of them, and indeed, I haven’t read all of the ones that I’ve mentioned, I’m just listing them as examples of what is available.
For books, it’s probably a good idea to read some of the reviews, and have a ‘look inside’ on amazon if available on which ever book(s) you feel might be of help.