Hello, First of all, I am sorry for the late reply.
When did the symptoms of your dog start? Can't your dog step on the right back foot at all? If you send me a video of your dog's symptoms, I will help you with more detailed consultation later.
First, inspect your dog's painful area.Check your dog's joints and bones. If your dog's joints are swollen and hot, it can be a ligament injury or a fracture or a luxation In this case, you should visit a nearby animal hospital for an accurate diagnosis and treatment.

If there is no abnormality in the range of joint movement of your dog, and there is no doubt of a fracture, it may be a simple sprain.

For the first two to three days, massage the area with an ice pack, and if the symptoms improve, massage the joints or muscles with a warm towel afterwards.

Do not walk your dog too hard and keep it indoors for at least two or three days.

Nose running a little. She peed in the house for the first time and she never do that.

She can’t walk on her back right like and she’s been shivering