Shar Pei Resource / bearposhsharpei Winnipeg Manitoba Canada

Hi, can I get some advice please! I have a beautiful pup who I am a bit worried about... whenever she runs or actually even walks her back legs are very stiff, they move as one. I am just wondering if that is normal? Or am I only seeing when it she runs, and is that normal? I have no idea, is it normal with the breed? I don't notice it with other dogs. Any advice would be great. Thanks.