I am so sorry to hear this. And I also believe it is a blessing that we can take away the sufferring of our furry family members.
In november we had to put down our 9yr old lab/sharpei mix. She was the sweetest dog and played nursemaid to both our children from birth. She would come get me anytime the babies cried.
We told both our children (7 & 4) that she was getting sick and would not be getting well and that we would eventually have to decide to take away her pain when it got too bad. When the day came, my 4yr old was with me while at the vet to check our dog who suddenly went lame & was diagnosed with a tumor pressing on her spine. After a call, my husband came with our 7 yr old. Both children were asked to say good-bye to our dog and asked if they wanted to stay in the room when she was given the shot. Both said no after saying their good-byes. Our 7 yr old was sad and cried and talked and asked many questions. Our 4yr old got mad, mad at the vet, mad at the techs but mostly mad at me. He yelled at me for the entire ride home. I told him it was ok to be sad and mad but not ok to yell at me or kick my seat. After the 15 minute carride home he had settled a bit and when he saw our other dog, both children became occupied with treating her kindly as she would miss her friend.
We still talk about our dog. Look at pictures. Share stories of how sweet she was. And now give our only dog more attention. The children do not seem any worse for the experience and it has led to some wonderful talks about responsible pet ownership and knowing when to let go to take away suffering and pain.
We also have read many books about death & loss as both my MIL and my Mom died within a year of each other from cancer. One good book about pets declining is "dribbles" (about a cat who comes to visit and is taken in decline to be euthenized).
Again, I am so sorry.
Regards,
ann m.