Thank you for sharing . I am so sorry to hear that you have lost your beloved Toby. It is very common after a death to think about what could have been different and to experience feelings of guilt. You may like to read the fact sheet on the Griefline website about loss of a pet which talks about coping with these feelings of guilt.
It sounds like Toby was a very loved pet whom you cared a great deal about. I hope you find ways to keep remembering him and the times you shared with him.
Don’t hesitate to repost in this forum , contact the Griefline helpline or book a call to Griefline as you deal with this loss and grief.
Take care .