Here is some information on areas that are dealing with mandatory spay and neutering legislation according to the AKC:

New Orleans, LA – The City of New Orleans is expected to vote on a mandatory spay/neuter proposal on November 5. The proposal requires dog owners to have all dogs spayed or neutered by six months of age, or obtain a breeders permit. The proposal also seeks to limit female dogs from producing more than one litter per year, and makes it illegal to breed a female dog that is younger than 18 months of age. The AKC has worked closely with local clubs and dog owners to defeat it. Visit the Government Relations Legislative Alerts web page for the latest information.

Las Vegas, NV – The Las Vegas City Council has designated a committee to review a proposed mandatory spay/neuter ordinance for all dogs and cats over 4 months of age with few exceptions. The AKC encourages all local fanciers and breeders to contact the council and express opposition to this proposal.

Johnson City, TN – The Johnson City Commission is hearing a presentation from local animal shelters on November 5 that is expected to include a mandatory spay/neuter proposal. No proposal draft is currently available. The AKC has notified local clubs, AKC officials, and breeders of this hearing and will continue to monitor this issue.

Moorhead, MN – Moorhead City Councilmember Greg Lemke made a presentation to the city council encouraging adoption of ordinances that prohibit ear cropping and tail docking, mandate spaying/neutering of dogs, restrict tethering, ban loose dogs in pick up trucks and prohibit roadside pet sales. There is not a proposed draft of changes. The AKC GR department provided council members and the mayor with information on these issues and urged them to work with local, responsible breeders and owners to draft legislation that will positively impact animal control issues in their community.

Pomona, CA – The Pomona City Council has asked its staff to prepare a draft of a mandatory spay/neuter ordinance for their review. The AKC contacted local delegates, judges, club officers and breeders and asked them to monitor the issue. A group of local dog owners attended the October 5th council meeting and spoke about why mandatory spay/neuter ordinances are ineffective and have not been successful in other communities.

I'm a huge advocate of spay/neuter as most puppies born are due to carelessness or used as an income by people who actually know very little about breeding.
However, after talking to vets at Purdue University, COE breeders, and owners of dogs who have been victims of bone cancer, I'm actually thinking of trying to wait until my new pup is 18 months old to neuter, as studies are showing that early neuter greatly increases the risk of developing bone cancer in Rottweilers, and possibly other large breed dogs.
http://cebp.aacrjournals.org/content/11/11/1434.full
Having lost two beloved dogs to osteosarcoma in a year's time has prompted me to question early spay/neuter, but I still intend to neuter. If I lived in a place that had a mandatory spay/neuter law, and my dog was found running loose, I would only have myself to blame if the law would suddenly apply to my dog.

Hiya Ann! Thanks for the link!

I'm thinking its different for every breed, I've also heard that its better to neuter large breed dogs later rather than sooner. However a number of other studies have suggested that there is no problem with neutering them very early, I guess its always really up to the individual.

You don't mind if I crosspost this and post that link on another thread?

No, I don't mind. Post it wherever you think it should go.