If you're looking for a companion animal here are a few places you may want to start.

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The Mayor's Alliance for NYC's Animals, a 501(c)(3) non-profit charity, is the sole umbrella organization for animal welfare in NYC. Since 2003, they have been working with a coalition of 150+ rescue groups and shelters to find homes for thousands of New York City's dogs and cats. Their goal is to transform New York City into a no-kill community by 2015, where no dogs or cats of reasonable health or temperament are killed simply because they do not have homes.
While they work collaboratively with the City of New York, they are a 501(c)(3) charity and do not receive any government funding, nor are they a city agency.
Over 300,000 adoptable pets.
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Main Line Animal Rescue
Main Line Animal Rescue has helped thousands of animals find new homes while launching one of the most successful anti-puppy mill campaigns in the history of animal welfare.
Best Friends Animal Society
At Best Friends, we want you to always think adoption first when you are considering adding a new family member. Of course, we'd love for you to adopt from us, but ultimately, choosing adoption is one of the most important differences you can make for a homeless pet.
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Remember, you can always find a wonderful companion animal at your local Animal Shelter or SPCA