Absolutely ((Cheri))
I can imagine how devastating this would be to your son (and the rest of you). Nothing in this world compares to the unconditional love our dogs give us. It takes our breath away when we lose them, but your son will carry with him all the funny and sweet memories of his beloved Millie for the rest of his life. She'll continue to warm his heart.
P.S. - Millie was my mother's name.