While it is critically important to meet dog's basic needs for food, water, shelter, and appropriate healthcare in any environment, dogs maintained long-term in kennels require substantially more than a balanced diet and a clean environment. Good animal welfare extends beyond basic biological functioning; we must assess the dog's environments comprehensively. Evaluating and protecting the welfare of kenneled dogs depends on our understanding of all their physical and behavioral needs. Ensuring that dog behavioral and psychological welfare needs are met is essential to providing an environment where dogs can thrive both inside and outside the kennel. This 3-page PDF publication explores current knowledge about dogs' needs for space in kennels.