The dog food used by a boarding kennel costs $0.33 per ounce. Depending on its weight, a dog may eat as little as 6 ounces per day or more, including and up to 24 ounces per day. The equation, C = 0.33z, represents the relationship for the cost, C, based on the number of ounces, z, a dog eats per day. What is the domain.