Inuyashiki

Inu Yashiki is a manga written and illustrated by Oku Hiroya.

Plot
Inuyashiki has a family, a wife and two kids, none of whom care about him. When he learns that he has only three months to live he realizes that the only one who will miss him is his dog. Shortly after this realization he is killed in a crash landing by aliens. He is rebuilt by them as a machine with a human exterior. How will his life change now that he isn't human?