Well that depends on how thirsty your pet is. I don’t mean to be sarcastic – but it’s true, if your dog just came in from a jog, its different than if your dog just came in from another room.
Also, just like us – if it’s drier outside (think Minnesota winter) or, of course, if it’s hot – pets will drink more.
Also, what are you feeding your pet? If you’re feeding moist food – then there’s inherently a high water content in the food, so a cat, for example, on a moist food only diet, may require less water than cats on a diet of only kibble.