The easiest way to adopt a free puppy is to look at local animal shelters to see if they have any special deals or fee waivers for puppies in their shelters. Many shelters do this periodically to help find new homes for more dogs.
Free puppies may be harder to find than free adult dogs because they are in higher demand, so consider looking for a young adult instead. Some shelters also adopt out senior dogs for free. Begin by contacting animal shelters and rescues in your area and asking if they offer any fee waiver programs. If you are a senior citizen, military veteran or have a disability, you may also be able to find a charity that pays the adoption fee for you.
You can also consider a private adoption. Many people give puppies away for free because they cannot care for them. This is riskier than adopting from an animal shelter because the puppy has probably not been tested to make sure it is healthy and has a good temperament. You also generally cannot return the puppy if there are problems. To find a free puppy, ask friends or family if they know anyone giving a puppy away or look at online classified sites like Craigslist.