Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
Which specific legs are affected?
it seems to be the back legs
Is there weakness and scuffing of the paws?
Did they check reflexes?
yes reflexes c hecked not sure what you mean about weakness etc
If the bones are normal and there is back leg abnormality / weakness / discomfort - based on age, breed, and history, an additional cause to consider would be a problem of the spinal cord in the back, such as a herniated disc.LINK HERE with more information.For situations such as this - STRICT rest is needed, often crate rest if we are to try medical management.
Moreover - If you wanted to see a specialist, I would have your vet refer you to a board certified veterinary neurologist These are veterinarians that went through veterinary school, and then did not only at least 1 year of an internship, but then did a 3 year residency ONLY focusing on this speciality to best diagnose and treat conditions such as this.
Please let me know if you have additional questions I can help with!
would you be able to tell me a veterinary neurologist near to me in brighton sussex