This Old Dog lyrics

This old dog of mine don't seem alright He kicks his leg, he don't seem fine He drifts away when he close his eyes I think he's lived another life I think my dog was once a spy A double agent in disguise I think he knows much more than he show He doesn't chase the balls I throw I think he knows of what I did He's watched me close since I was a kid I think he knows I'm in too deep He knows what I do when I weep He tells me things but does not speak