My husband is a Vet at the university. He is also part of AVMA, Vet pathologist and is going for his 2nd board in Lab Animal Medicine...
I work in Comparative Medicine with a lot of vets. And they have to follow Institution of Animal Care and Use Committee (IACUC) standards under AALAAS--lab animal medicine following governmental procedures of Office of Lab Animal Welfare (OLAW)...
So basically, all animals coming into my own personal house have to be thoroughly documented...
My husband told me I can never purchase or adopt an animal from Petco... Then he showed me the quality of animal care... He is an aquatic vet--fish and frogs. All of Petco's fish had fungal infections that are difficult to treat... Most of the workers are not trained as vet-techs or anything above that. Barely a vet works there and these places are not as highly regulated from the government like a farm, shelter or university...
"Adoption Day" at Petco would need a recourse with constant vet care if you choose to adopt the animal. Also, purchase medical insurance on the animal.
Feral animals are extremely difficult to handle, generally. I would read up on handling these kinds of animals.
Then I would get extensive medical documentation on the animal because the problems you are noticing could be just about anything...