Ahh, your poor baby! She's very young which is good. Unfortunately, the breed of samoyeds are prone to hip dysplasia. It's genetic. They are also known to sometimes get bone and joint problems. Is she at all over weight? It's important to keep her at a healthy weight because of these predispositions. So, do you take your dog to the vet like once a year? Probably for shots or something I am guessing. I do a shot clinic to avoid the vet charge but . . . sadly, I would go ahead and make a full vet visit when it is time for your annual visit. They will hear what you have to say describing her discomfort. Then they do a physical exam. They will manipulate her hind legs loking for discomfort, grinding, range of motion, etc. They might take her blood. And an X ray gives complete diagnosis. I know it is expensive to do all that so maybe just the vet visit would be enough. Weight management is essential and being careful about her activity as treatment. They may opt to give her a anti-inflammatory non steroidal medicine. And they will offer surgery if it gets too bad. This is all IF this is diagnosed for her. By the way, a healthy diet goes a long way to help prevent hip dysplasia too. Glucosamine is a joint supplement that they also give dogs (can be in her food even).
Let me know what you think.