Not every dog is cut out to work with the government, but that can be to your advantage if you're looking for a cuddly, sweet pet to adopt.
While many dogs go on to have successful careers, some don't for reasons such as "nervousness" or even being too "nice," reports CBS affiliate WNCT.
The TSA has an adoption program for drug-sniffing dogs that didn't make it to graduation.
Mission K9 works with older service dogs to find homes for dogs looking for retirement, too.
So, while these dogs don't become service dogs, they can still be great pets.