He was 7 weeks old, 2.7 pounds, and small enough to fit the life Jonathan Ray thought he had room for. In San Diego, with limited living space, Ray adopted Pharaoh after the shelter listed him as a Chihuahua mix and told him he would stay under nine pounds.
That promise shaped the decision. Ray wanted a very small dog, one he imagined as a “backpack puppy,” and he said he carried Pharaoh everywhere during their first month together. Then the puppy kept growing.
Within a few months, Pharaoh weighed about 25 pounds. Ray went back to the shelter looking for an explanation, especially about the dog’s parents. Staff told him Pharaoh’s mother was a 13-pound Chihuahua, but they had no information about the father. By March, as Pharaoh neared age two, Ray said the dog weighed nearly 40 pounds.
The eventual answer came from a DNA test. “Turns out, he is a Chihuahua and that’s first on the list. Second is pit bull terrier and third is American Staffordshire terrier. Fourth is toy poodle and miniature pinscher, both single digits,” Ray said.
That result helps explain the jump from tiny puppy to medium-size adult, but it also points to a bigger shelter reality: when parentage is unknown, breed labels and size predictions can be educated guesses rather than hard facts. The Journal of the American Veterinary Medical Association has argued that visual breed identification in mixed-breed dogs is unreliable when lineage is unknown. In one study cited in Pharaoh’s story, University of Florida researchers compared shelter staff guesses with DNA results from 120 shelter dogs and found that dogs with pit bull-type ancestry were correctly identified only 33 to 75 percent of the time. The same study found dogs with no pit bull DNA were labeled as pit bulls as often as 48 percent of the time.
Another larger shelter study, involving dogs in Phoenix and San Diego, found staff could match at least one breed in a dog’s genetic heritage 67.7 percent of the time, but when asked to identify more than one breed, agreement dropped to 10.4 percent. The researchers concluded in PLOS One that shelter dogs often have complex ancestry and that shelters may serve adopters better by describing a dog’s physical traits and observed behavior instead of leaning too hard on breed labels alone.
Size is part of that problem. Pharaoh was labeled a Chihuahua mix, and the article notes that the American Kennel Club says a Chihuahua weighs no more than six pounds. But a mixed-breed puppy can inherit growth patterns from relatives no one can identify at intake. A puppy’s current weight, litter history, and visible features can offer clues, yet those clues are limited when one parent is unknown, as Pharaoh’s father was.
DNA testing can fill in some of the blank space, but not all of it. UC Davis veterinary genetics experts say breed-identification tests compare a dog’s DNA with a company-specific database to find the closest matches. That can be useful background, especially when a dog’s lineage is a mystery. But UC Davis also warns that animal genetic testing is not regulated like human testing and that results should not be over-interpreted, especially for medical decisions. In other words, a DNA report may help explain why a dog looks or grows the way he does; it is not a crystal ball for exact adult size, personality, or future health.
Ray came away frustrated by the shelter’s labeling, and it is easy to understand why. Expectations matter in adoptions, especially when housing and daily logistics depend on the difference between a lap-size dog and one pushing 40 pounds. The JAVMA article makes the same point directly: when a puppy is identified as a small-breed mix and grows into a medium- or large-breed dog, that mismatch can create real problems for owners.
Still, Pharaoh’s story did not end there. Ray said the dog also went through an itchy skin problem early on. “He requires a Cytopoint shot every two months…The vet informed me that it was something he could grow. It seems he has. He hasn’t had a shot since July,” Ray said. Now, he and Pharaoh ride the bus or trolley together and spend much of their time outside together.
The strange part of a surprise like this is that the answer can arrive long after the bond does. Pharaoh was not the tiny dog Ray expected. He was, by Ray’s account, the right dog anyway. Have you ever adopted a dog with a story like this? Share it in the comments.
By Jake Patterson — Freelance feature writer and former animal-shelter volunteer focused on rescue, adoption, and second-chance dog stories.
