These are very energetic, very athletic dogs that require strong and powerful muscles as well as very flexible joints so they can move at ease. (mypetneedsthat.com)
They develop loose overly flexible joints, which are a starting point for arthritis. (2ndchance.info)
As the most flexible joint in your body, your shoulders rely on the serratus anterior for upward rotation of the arms and protracting the scapula. (health.com)