Paul McCartney talking with Chrissie Hynde - quoted here -
http://www.archer2000.net/lindaremembered/prairie2.html
+ "The song 'Cow,' which is about a cow in its last day grazing in a field before it is sent off to the slaughterhouse, is a pretty tough song. Linda played it to friends of ours and they just cried and went vegetarian the very next day as a result of this song."
"It is a powerful song and I cry too when I hear it. But it's typical of Linda, she wanted to get the animals' message over because it's so poignant." +
On YouTube -
http://www.youtube.com/watch?v=PZSUhRIEP90