Answer:

Allowing your dog to swim in your swimming pool does not mean that you are going to have green water. However, as you already pointed out your dog is urinating in your swimming pool, they can't help it. The bigger the dog, the bigger the . . . amount of chlorine needed to neutralize the contaminants. Also, your dog most likely contributes more contaminants than your average swimmer, maybe a lot more. Therefore, if you constantly allow the dog in the swimming pool you will need to add more chlorine and shock (superchlorinate) more often so that your pool does not turn green with algae when your chlorine gets used up.