Waldo has now been with us for a few months so we have gotten to know him better. He's about 3-4 years old with a gentle and happy nature, especially with people he knows. He has been non-reactive towards other dogs on leash for the most part but his behavior interacting with other dogs has been very unpredictable. At this time, we cannot recommend him for a home with another dog or cats. Waldo is crate trained, quiet and has a medium energy level.