Many dog rescue groups save abandoned and stray puppies and dogs and put them up for adoption for free. It is normal, however, for rescue groups to ask for donations to support the facility's operating expenses and an adoption fee, which covers the cost of vaccinations and neutering or spaying.
Some private organizations set up free animal adoptions on specific days to support animal shelters and promote animal adoption. The Maddie's Pet Adoption Day is the biggest free pet adoption event in America. The animal adopters do not need to give donations and adoption fees because Maddie's Fund covers these fees and the adoption costs by giving participating shelters from $500 to $2,000 for each adopted pet. The Maddie's Pet Adoption Day is an annual event that takes place in participating counties and cities in the United States.