The donation announced Wednesday comes from PetSmart Charities, an animal welfare group created by the founders of the PetSmart chain of pet product stores.

Kansas City’s Animal Health and Public Safety Division says the two ZIP codes were chosen because they have an estimated 1,400 unaltered pit bulls and pit bull mixes and large numbers of low-income residents.

Animal control officers will talk to residents about getting their dogs altered or vaccinated at one of three participating veterinary clinics. There’s a limit of four dogs per household, and the services will be offered until the $100,000 grant is exhausted.