The Pennsylvania SPCA released surveillance video of the person they are looking for.
The organization believes the same person was seen in the same area where puppies were abandoned.
The person was seen near N. Bread and Cherry streets on December 26. Six puppies, approximately three to four weeks old, were found abandoned in a parking garage. The puppies were immediately brought into the PSPCA's care, received expensive medical care and support, and have since been adopted, according to the organization.
The same person was then seen again on April 18, near Arch and N. Bread streets, dumping another litter of puppies. Witnesses reported as many as 13 puppies originally at the scene, but by the time officers arrived, only seven puppies were recovered. Officials say six puppies remain unaccounted for.
A total of 19 puppies were found.
The organization is urging anyone who may have taken the missing puppies to bring them immediately to the Pennsylvania SPCA's Philadelphia headquarters, as they are evidence in an active animal cruelty investigation, and their safe return is critical - both for the integrity of the investigation and for the health and welfare of the animals themselves. Puppies of this age require specialized care to survive.
Officials are calling these cases a "pattern of concern."
"Seeing a pattern of abandoned litters discovered so close together is deeply troubling," said Julie Klim, CEO of the Pennsylvania SPCA. "These puppies were left defenseless and completely dependent on the kindness of strangers to survive."
The PSPCA is also asking for help restocking supplies, such as blankets, treats and toys for all animals.
Anyone with information about either litter, including where the puppies came from, who may have abandoned them, or the whereabouts of the six missing puppies from the most recent litter is asked to contact the organization's Animal Cruelty Hotline immediately at 866-601-7722 or cruelty@pspca.org. Tips can be left anonymously.
The PSPCA reminds the public that if you are ever struggling to care for a pet, help is available. Please reach out before abandonment becomes the only option. Contact the PSPCA at (215) 426-6300 or visit www.pspca.org.