Nothing against you here...We're just offering advice & realize that it is your step-dad wanting to breed the dog...
That said...
Yes. Many dogs in shelters are pure bred dogs with papers...

Here's some statistics on how quickly jut ONE mother dog can produce a LOT of offspring:
A male or female dog of breeding age can produce an average of 6 puppies twice a year (12 total). Those 12 pups could potentially produce a total of 144 more puppies by the following year. Those 144 puppies could potentially produce 1,728 more puppies by the year after that. And so on and so on. Do the math. The numbers are astronomical. Every owner who makes the responsible and vital choice to spay or neuter will ultimately save thousands of lives.

Hard to imagine in just a couple years how many puppies those puppies can have...THAT'S how we end up with all those shelter dogs...

Good luck in whatever your step dad chooses to do...you seem to be a person that truly cares & loves animals! you're making the best first step by asking questions...

And by the way, welcome to the site, hope you enjoy it here!