The puppy's owner has now come forward, saying the dog was stolen along with another one of their dogs last week.
The other dog was found with its tag on and was returned to the family, but the puppy in the dumpster did not have a collar on.
No one is sure how long she was in the dumpster, her owners say she was stolen a week ago.
The woman who did not want to be identified was in tears after seeing her puppy Princess again for the first time since she says she was stolen.
"I'm so glad we found you," she said.
Two homeless women found the puppy in the dumpster near 7th Avenue and Grand Saturday. They're called Caring Hearts, a group that helps get the homeless care for their pets. The group posted a video on Facebook showing the moment the puppy was found.
"This is a heinous act of animal cruelty; I'm not sure I share the same planet with people who do this," said Dusty Lee.
The puppy, barely responsive, was taken to Alta Vista Veterinary Hospital.
"Very dehydrated, puss coming out of one eye, potentially she would not have survived much longer at all," said Dr. Michelle Johnson with the hospital.
FOX 10 aired the story of the puppy on Sunday and the owner saw it and came forward. She doesn't want to be identified, saying she is scared for her own safety.
She believes her dog was stolen last Monday by a family acquaintance who was out for revenge after a breakup; she says a police report was filed.
"It's heartbreaking; it's very heartbreaking to think that somebody can be so cruel," she said.
Princess is expected to be hospitalized for several more weeks and may lose one or both of her eyes. $2,500 has been raised in donations, but the bills are expected to exceed that.
"This is a young family; they do not have the financial means to cover substantial vet debt like this," said Cheryl Wade.
"I'm very grateful to everybody that's done what they have," said the dog's owner.
If you would like to help call the Alta Vista Hospital, they are taking donations to help in the pup's recovery, the number is 602-277-1464