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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
I am so sorry to hear Lily is experiencing this. Sounds like this has been going on for a while and your vet has ruled out anal sac infection or any intra-anal/colonic issue. If it came on suddenly and has only been going on a few days then my concern would be she might have happy tail or "swimmers tail" when a dog wags it so much that there is muscular pain. This will resolve over a week with good pain relief. But since this sounds like going on much longer, it makes me worried about a primary other srouce of discomfort such as bone infection or soft tissue infection or spinal trauma (radiating spinal pain) or caudal equine syndrome. An X-ray might be very useful to look for an obvious orthopedic (bone) issues such as a micro fracture or dislocation. As well very good pain relief such as a combination of an NSAID (e.g., carprofen) and gabapetin would be very good at this point. You can speak with your vet about all of these options.
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