we are going through this again now with Mr George, he showed signs of being very uncomfortable about his back end about 10 days ago, thought it was a hip strain ,because he has been pushing through a stair gate (10cm gap), but the Xray showed signs of 2 disc's narrowing, cage rest and 2 lots of pain relief straight away. he is now much more comfortable, althou quite lame in his hips, but he complains bitterly at times about being shut in. His mum is a vet nurse(my daughter) so she has advice on tap. She has decided to hold off about an MRI unless George deteriorates, sad thing is he is only 4, my other older girl show up the same symptoms last year age 6, she did well with time and cage rest, but you end up watching them closely all the time for signs.