Zeal Lactose Free Pet Milk for Cats and Dogs Dogs need both solid and liquid food. When thinking of liquid, one tends to think of only water. At Zeal we know what is best for your dog and have produced pet milk specifically formulated for both puppies and adult dogs. New Zealand produces clean and fresh milk and we want your dog to enjoy the flavour and nutrients in our pet milk range. ZEAL Pet Milk is made from lactose Free cows’ milk and is easy to digest while maintaining all the natural goodness and taste of cows’ milk.