I don't know the specific cause, but we owned a cow for several years with the same malady. I think it may have been some sort of neural issue, as she did not use her tongue to gather grass to her mouth like other cows. Did't seem to cause her any harm though, since she was a chunky as anyone else.
Also, if it's an extremely hot day or we really warm animals up on a trail drive, they will all have their tongues out until they cool and stop panting.
Last edited by 1minute; 02/01/09.
