So some days my puppy doesn't get a proper walk but we have a big garden and field and he runs around there loads, he doesn't get fetch, never has, but if we throw a toy he will chase it. He entertains himself beautifully with his toys running in and out the house. He's a happy, content chilled little boy. If I don't get time walk him some days (especially in this heat) is that ok? He's slim and healthy.