Interesting story and to me, completely believable. I have not trusted shelters and adoption agencies for many years.
I used to volunteer for a shelter here in the Valley many years ago. I recall a purebred chocolate lab come in, had registration papers and all the accessories, a crate, lots of toys, a million collars, a full bag of food, bowls, etc etc. It was a traditonal Brittish style lab, short and stocky and a very reddish tint to his glossy chocolate coat.
A new girl was feeding the dogs. She claimed he growled and snapped at her. I was in the day after that and it was quite a buzz let me tell you (Viscious dog!!!)
I came in for my scheduled volunteer shift 2 weeks later - he wasn't there. I figured he was adopted - a very handsome dog, happy-go-lucky tail wagging lab, very calm.
Nope. What lab? Oh, did I mean that red pit bull dog that bit Jessica? He had been put down.
Ah.. he was not a pit bull. And he had not bitten anybody.
Fast Forward.. I was in Wisconsin, I decided to go to the local shelter and have a gander at their critters. I did that from time to time when I knew someone that was looking for a dog and was unsure how to select a dog for their needs.
Came across this female american bulldog that was labeled as a white boxer, and this adorable AmStaff male. He was super friendly, laid back, who gives a crap dog. I asked to see him, walked him around in their little designated area, he was a great dog, not dog aggressive, not anything aggressive, he just wanted a good scratch, and a nap. Behaved well, heeled on lead, sit, down, stay, shake, roll over etc. His chart said "Very dog aggressive." ....
Ah next row. Beautiful young male lab mix (looked like alab/chow). Lunged at me and bit at the chain link as soon as I got within 3 feet of the kennel. I continued down the line, and the next dog was an older female golden, she came over to the corner and stuck her nose through with a wagging tail and kind eye - that 2" where that young lab mix could see her head past the concrete divider between the kennels, he went NUTS! Snarling, pawing, spinning, jumping, snapping, barking. Deep, menacing barks. His chart said "friendly, good with kids and other animals"...
Who knows, maybe I caught those two dogs on a fluke. Likely not, as they had more dogs mislabeled per breed, one female was labeled a male, and on my future visits I noticed every pitbull looking dog (they had 4 at that time vs just the one) was labeled as a special adoption, one pet home, dog aggressive animal.
There is taking a precaution, and then there is just being stupid. I never went back and advised people I knew to get the opinion of an outside trainer before every adopting from them. (they had a "resident trainer" that came in once a week for 4 hours to "rehabilitate" the dogs)
I tread carefully with shelters and rescues, I think the idea of it is grand, it is a great thing, but for the most part they don't know what they are doing, that is why you get dogs being returned to shelters and rescues 3, 4, 5 times - they are not being matched with proper homes and handlers or properly evaluated from the start.
Ah. My 2 cents.