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If imaging has not been done, I'd recommend doing that. It could be a problem with a disc in the back or at her age, it might be a growth. Normally dogs display this distancing behavior when they have an illness and usually one worse than just arthritis. They do this instinctively as in a wild pack situation, a sick dog might be driven out of the pack or even attacked.
So while blood work can indicate a lot of conditions, without imaging, there still might be some health issues that need to be considered here. Hypothyroidism is common in the breed and can cause behavioral changes as well. This does require a thyroid panel be done to diagnose this.
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