Some time ago I read one that I do not remember the name, I've been looking for it too but I can not find it, if it sounds to you, please?
Sesshomaru and Kagome go to mate, but a witch or sorceress in his palace becomes angry after being rejected by Sesshomaru and curses him in the body of a mortal dog, with time of life of a mortal dog also, but reincarnating always in a simple dog while remembering all his previous lives, until he meets Kagome in modern times I think with his children.

Please help me to found.