That’s how I found my best ever dog!!! Mom was a registered Golden Retriever with papers out her rear. Dad was a registered German Shepherd with papers more impressive than mom. Well, when they fell in love, dad jumped the fence & lo & behold, some of the most precious mutts you have ever seen appeared!!!
The owners of both mom & dad had been seeing $$$ in front of their eyes because of the dogs impeccable breeding. Boy were they surprised when these fluffy Golden Shepherds emerged from hiding. Of course mamma had 15 of them little suckers!!! I used to laugh that I had me a pedigreed mutt & I got him for FREE!!!
Now, to answer your Q, put signs up around your neighborhood saying “free puppies”. Where I live, flea markets are very popular & many people show up with a box full of puppies just waiting for the little kids to show up.
My vet has a bulletin board just for such events. Take a pic of mom & dad with the puppies surrounding them, put them up on his board, & the phone will start ringing. Might be an idea to talk to your vet…worst response you’ll get is NO.
You can have a yard sale with puppies for FREE…OR…advertise it on FB!!!