I just finished reading a book called Dog Years by Mark Doty. There were a couple of quotes in there about dogs that I wanted to quote here. They are both from the same poem: The Housedog's Grave by Robinson Jeffers
I've changed my ways a little, I cannot now
Run with you in the evenings along the shore,
Except in a kind of dream, and you, if you dream a moment,
You see me there...
I am not lonely. I am not afraid. I am still yours.
The last line of the poem says it all about loosing a companion be it animal or human.
Here is a link with the whole poem: http://www.sarbin.com/otis-n-jake/stories/housedog.html