We pay $10 for 5 hours and $16 for a full day at Top Dog in Norman! It's open from 7AM to 6PM.
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There are also Camp Bow Wows in Moore and Edmond and they charge $20 a day. I believe their open from like 7AM to 7PM.
Camp Bow Wow® - Moore - Pricing Camp Bow Wow® - Edmond - Pricing
Great idea, though! We LOVE doggie daycare! Where are you located again? If there isn't one in your area, I think there's a great market.