Some groups offer deep discounts too, like Clark Co Animal Welfare, they have a thrift shop in Springfield where you can get info
Off hand, I do not....I know of discounted spay/nueter places, but not free. Going thru one of the places the Humane Society does business with is about the cheapest way u can go, they have specials every now and then....but I would call up Animal Resource Center on Webster St because all they do is dogs. They may have other specials for dogs that the Humane Society does not.
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