Touch Pets - Dogs 2 on iPhone Help?

I recently got Touch Pets - Dogs 2 on my iPhone. I find it a lot of fun, but I was reading the comments and some people are saying they got charged 0.00 - 0.00 for in app purchases. Does anyone know exactly what these purchases are?

I’m thinking they are just when you BUY coins and bones.
However, now I’m worried it costs you when you collect coins from the furniture and then purchase toys/food for your dog. Can someone please let me know?
I would really like to ease my mind about it so any help is appreciated.

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