not a thing! lol Happy is the perfect dog! she is a big dog that could be passed off as small with no questions asked lol actually people have have known her longer then I have are suprised when they here how big Happy actually is lol the funniest was juston wed. when I commented on how much Lightning looked like Happy, and the responce was, ya, but Happy is a LOT shorter uhhh Happy is at least 4" TALLER then lightning! and people dont believe it! I swear we could tell everyone she was out 17" height dog and not a single person would question it, and at 21" she is one of the tallest in the club she is calm when needed, funny when needed, and super energy when needed, plus she is really, fast, she is the dog everyone wants, loves kids etc... well ok the only thing I would change about her is make her not dog aggressive.