My parents actually have 2 dogs(well,1 now of coarse). The one who died was a male,the other is a female. It is very obvious that dogs grieve just like people. The other dog has no idea where he is,and it shows.She has not eaten all day and just mopes around.She isn't as old as he was,but she is around 8 I think.It has been the two of em her whole life.This is the first time since she was a very small pup,that he was not there.This makes me think of that book "Where the Red Fern Grows". I certainly hope she snaps out of it after awhile.