Police found the dog outside of an Inwood grocery store and posted its picture on Facebook.
Advocates discouraged pet shoppers from buying animals and offered cats for adoption instead.
Two young New Yorkers launched a $70,000 crowdfunding campaign for a dog play space and cafe.
The mayor's office sent out an email Thursday asking volunteers to temporarily house dogs and cats.
John Mancuso had called the animal shelter system "inhumane" and "cruel" during his campaign.
The 109-year-old Bideawee on East 38th Street suffered severe damage during Hurricane Sandy.
A dog lover brought one of her rescue dogs to Central Park and rented out walks with him to raise funds.
A book by Mark Ross, "Animal Shelter Portraits," features photos of pets on death row at a city shelter.
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