I have worked with all types of dogs from small Chihuahua's to Huge Great Danes. Have sat up too 7 dog's at a time with no issues or bad treatment due to the amount of space I have at home. When I'm not home I'm working part time at a doggy day care where I take my boardings to play with other healthy dogs. I also trained dogs the basics and house broke them. when i have them over my place i don't crate i have dog beds or ill have them sleep with me. the time spent i use it to train them and teach them behavior. i like to take them to work with me when i need to or i take them out for a run depending on the dog of course.