I had a dog that would always sit facing the speakers dead centre whenever Floyd was on. Anything else and he would lie down with his back to the speakers. But the one track that slightly disturbed him was Dogs. He would walk up,to each speaker in turn even looking behind the speaker when the 'barking' began. Happy days.
A very, very long one today. 17 minutes(!).
Also, this: www.youtube.com/watch?v=jqULy8xQjZU
The version linked is a very early live recording from before even Wish You Were Here came out. Lots of completely different lyrics.