Sweetheart you didn't kill your boy, giving a fur baby their wings when their pain is so deep is the Greatest Act of Love of all. I believe when he stared straight into your eyes it was his way of saying "Thank you Mummy, thank you for making it stop".
He is now playing in the sunshine and the rainbow lights of the bridge. Take comfort in the fact that one day you will get to hold your little man again, he will be the healthy puppy that you knew and loved, you will run together and play together and he will rain a thousand sloppy puppy kisses all over your face.
My heart goes out to you and sending you all the healing light and love possible.
RIP Little Man
Your Mummy loves you very, very much, she told us all about you.
Soar High with your Wings
Roiley