Sprain
A sprain is an injury that affects the ligaments (joins bone to bone), commonly affected areas is the Stifle (Cruciate Ligament) Hock & Tarsus (ankle) Toes Wrist (carpus). As with a strain the ligaments overstretch and can rupture or tear, leading to pain and the inability to use the affected limb.
4 Grades of Sprain:
Grade 1: Minor tear or stretch
Grade 2: tear followed by swelling
Grade 3: Complete rupture
Grade 4: Ligament breaks and takes a small piece of bone with it