American singer-songwriter Cyndi Lauper has posted a message on her Facebook page voicing her opposition to Montreal's newly adopted pit bull ban.

She calls it a "sad day" and an unjust bylaw.

Lauper adds, "it's not the dog, it's who is training and often mistreating them that should be banned" and invites opponents of the ban to sign a petition entitled "My Montreal includes all dogs" on the GoPetition online site.

The singer also wrote in a message posted Wednesday and shared more than 3,000 times that there are "many amazing pit bull and pit bull mixes out there" and also vicious dogs of other breeds.

Montreal city council voted 37-23 in favour of the new bylaw on Tuesday following a heated debate.

The legislation includes a ban on new pit bull-type dogs as of next week. It also places restrictions on those currently in the city, including the requirement that they be sterilized and wear muzzles in public.