Part-Time Nanny

I have a 1-year-old son (15 months). I work from home but he's an active boy and likes to run around and play, especially in the backyard. I would need someone to watch him and play with him while I work. He takes 1 nap around noon and when he wakes up you'll need to feed him lunch. Lunch is normally something simple like chicken nuggets or grilled cheese and some fruit. We do have a dog named Luna. She's a German shepherd. I just ask that you throw the ball for her in the backyard while my son is taking his nap. Normally, she's done chasing the ball within 5-15min depending on how hot it is outside.