It usually comes on suddenly. Stumbling and struggling to stand because of lacking support from her hind legs. Loss Of Balance Unbalanced Gait In Cats Petmd Also with vestibular syndrome the cat may be unable to stand and may roll toward the side of the lesion sometimes rolling completely over time and time again. Cat unsteady on back legs . Although there can be a number of causes one of the most common and painful in cats is a saddle thrombus. Dec 28 2009. Both the duration of the loss of control and the severity of the instability may vary depending on what is causing the issue to exist. She is unkempt and does not groom herself any more. Not jumping on the curtains or running across the room the way she used to. A loss of balance can occur when a cat is suffering from vestibular disease. Sep 9 2011. Our 19 year old cat has suddenly developed wobbly back legs and twice in the last couple of days has slightly staggered to the side when walking. When a cat needs ...