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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
Have any x-rays been taken of her spine and hips?
That is going to be the most important diagnostic in determining what is wrong with Trixie's gait. If she does have hip dysplasia, chances are she will need to have joint supplements and NSAIDs over the course of her life. The lack of tail may be a sign that she has a congenital abnormality with one or more parts of her body, so a close examination would be very wise given the way that she runs.
As far as the short term, no, I think she will likely do fine as a puppy. As she grows problems may become more obvious. The gait she has may indicate more concerns than just hip dysplasia. For example, there's a congenital abnormality in puppies where the head of the femur (ball) does not fit into the hip (socket) because it never developed. We can see a similar gait in those puppies. The only way to know for sure what exists will be to have x-rays performed to see the condition of the bones involved.
Sure thing. If I can help further just let me know.