Oh OP, I’m so sorry. It’s the hardest thing.
We actually bought some books to help, maybe go to the library if you get the chance and need to next week? There are some brilliant ones now to open up discussion softly. The Invisible Leash was one from memory. Or some audible ones - I think “The book your dog wants you to read” is available.
We were quite matter of fact and explained that the line would make DDog sleepy then a medicine would very gently slow down the heartbeat until it stopped, that DDog wouldn’t feel a thing and that we were stopping his pain 💔
Keep the communication open. Mood swings and sudden bursts of a different side to your DCs may be seen and they may embrace you or they may push you away but please remember it’s not you they’re cross with, it’s the situation.
One day, whether it be 12 weeks or 4 years time, you will all be in the right emotional place to look at photos and smile without crumbling at some point in the future. I am 5 years on and with a lot of therapy, only just getting there. Grief has its own timeline and everyone has their own way of dealing with it.
The Blue Cross and The Ralph Site both helped me.
Thinking of you all xxxx
www.bluecross.org.uk/pet-bereavement-and-pet-loss
www.theralphsite.com/index.php?idPage=4