There is nothing in the rules that say you can't give the name of your vet. What you can't do is post links to websites, or plaster their contact information over the internet (ie. people can look them up in the phonebook themselves).
There are several threads about that in the Contact Mods forum, including this recent one: http://www.boxerworld.com/forums/showthread.php?t=75294
There are several threads about that in the Contact Mods forum, including this recent one: http://www.boxerworld.com/forums/showthread.php?t=75294