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Some pit bulls can be vicious, others friendly, but no matter what their demeanor, the ASPCA says too many pit bulls are ending up on the streets and in shelters.

"If you look at the numbers of all the dogs that come into the shelter every year, 43 percent of those dogs are pit bulls," said Aimee Hartman, director of the ASPCA mobile clinic. "And the dogs that are put to sleep, 82 percent of those are pit bull or pit bull mixes."

That's why the ASPCA started a campaign targeting owners of pit bulls, rottweilers, and other large-breed dogs, who the organization says are mostly young black and Latino men in the city.

The organization is using a graffiti advertisement that reads, "show your boy you've got his back. Fix your dog, it's all good."

There will be English and Spanish radio and newspaper ads, as well. The goal to get as many of those dogs as possible spayed or neutered to reduce the number of puppies being born.

A veterinarian can charge hundreds of dollars to spay or neuter a dog, but the ASPCA say its mobile clinic program is free for people who receive public assistance or live in public housing. For all others, the organization is only asking for a donation of $25.

The mobile clinic will be in each of the boroughs. Licensed surgeons and technicians are on board to do the procedures.

"I think it is good," said one New Yorker. "I think they should keep doing what they are doing; keep the dogs off the street."

It's no secret that some people breed pit bulls and other large dogs to fight or to make money by selling the puppies. But animal advocates say too many dogs are not cared for properly.

"Maybe when these guys get their dogs or pets, they get them for a certain reason," said another New Yorker. "But in order to care of them they need to be spayed. So get your pet spayed or neutered."

Besides prohibiting these dogs from breeding, the ASPCA says there are other reasons for pets to be spayed and neutered.

"It reduces a number of types of cancers and allows an animal to live a longer and healthier type of life," said Hartman.

For more information on the mobile clinic spay and neuter program, call 1-877-SPAY-NYC or go to ASPCA.org/petowners.