3.2L Capacity – Best for Small to Medium Dogs. Perfectly suited for small breeds and medium-sized dogs.Can also work for large dogs, but may not be ideal for homes with multiple dogs.You may need to refill water more frequently for larger or multiple pets.

7L Capacity – Best for Medium to Large Dogs & Multi-Dog Households. Ideal for medium and large dogs who drink more water.Great option if you have two or more dogs.Significantly less frequent refills thanks to the large water capacity — saves time and effort.