Countries where cropping has been illegal:
(some for centuries:

• United Kingdom: Cropping has been illegal for over a hundred years.
  I believe Queen Victoria banned cropping because of the animal suffering. No dog with cropped ears can take part in any Kennel Club event.
   
• Australia: Cropping is illegal.
   
• Canada:
  In Newfoundland and Labrador cropping has been illegal since 1978 under the Animal Protection Act.
  Nova Scotia, New Brunswick, and PEI are not allowing cosmetic surgeries as of October 2010.
   
• New Zealand: Cropping is illegal
   
• Netherlands: Ear cropping became illegal in the sixties. September 2001 docking was also illegal.
   
• Belgium: cropping was illegal by end 2001. January 1st 2006 docking became illegal.
   
• Italy: Cropping is reported to be illegal. Docking is reported to be illegal since February 2001.
   
• Germany: Docking and cropping have been forbidden for a few years. Docking was banned 1st June 1998 with exceptions for working gundogs.
   
• Scandinavia (Norway, Sweden, Finland, Iceland, and Denmark): docking has been also banned for years.
   
• Switzerland: docking has been illegal for a couple of years.
   
• Sweden: Cropping has been forbidden for at least 30 years and docking tails has been forbidden by law since 1989
  
  PLEASE advise any I've missed. I'd love the dates, too.