Thanks gpm,
She appears to be OK this morning, her mobility is better etc. I will check along the spine, the theory sound plausible to me. She was found in a back alley with her brother when they were about 10 days old. They both had puppy strangles and her back leg was badly broken and infected. She is now 7 years old. The "bad" leg has the lower ankle joint that is about 2x the size of the other, all fused and hardened bone. I'm quite surprised that she hasn't had more problems before. Thanks for the website.
Off topic: I've never used Rescue Remedy before, but had a former adopter call me quite concerned because she is moving to another city with an already nervous cat with toiletting issues. She is very keen to try homeopathy, but I though maybe Bach flower or rescue remedy would be a better idea. The cat is anxious when left alone, is very insecure but yet will "bully" other cats (she has no social "cat" skills, probably taken away from mom too early). She has a finicky stomach (wrong food = diarrhea) and a pronounced head tilt (appears to be neurological -she can hold the head up when she sits, but she must tilt it to change direction, when she is nervous or anxious her head shakes). She simply does not do well with change and will urinate on clothing or other soft items belonging to her owner. She is extremely fussy about a clean litter box (it must smell fresh and fragrant for her to use). What do you think? Should I try to work up the case or maybe just go with the rescue remedy?