>The first time he did it I thought he was in pain but my vet assured me that wasn't the case and it was definitely the anaesthetic that caused it.<br />
Harley
The first time that I heard this to any great degree, was when I visited one of my own dogs in hospital. The nurses were wheeling in (from the operating theatre) a dog whose op had just finished. I watched them make him totally comfortable in a large bottom pen, and they carefully made sure his tongue was out.
The girls left, and I was murmuring sweet nothings to my own dog, when, from behind me, came the most horrendous howling. I mean really, really loud, I nearly jumped out of my skin. It was a very large breed, but I had not been prepared for how loud it was. I thought I was being pursued by the hound of the baskervilles!