Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to tell if your cat is blind [title] Look out for clumsiness. [step] Watch to see how your cat gets around furniture or if it misjudges jumping onto furniture. Also note if your cat bumps into walls or furniture that it previously knew to walk around.

Ending1: The cat may overshoot and jump into a corner. This could simply be a side entrance in a busy kitchen. Ending2: Acting clumsy in spaces where it spends a lot of time can be a sign of failing sight or blindness. [substeps] Another sign to watch for is if your cat is tripping on stairs or slipping when trying to jump up to its favorite place. Ending3: [substeps] Similarly, check behind furniture and curtains for unusual barking sounds while you are watching television or taking a walk with your cat. If you detect swelling or redness of your cat's eyes, this may be a sign that it is blind. Ending4: If this is done repeatedly, the cat will be able to not only see pieces of furniture on the floor, but also footing each piece off the floor. [substeps] Some physical or mental changes in your cat's development may also cause this behavior.

Answer format: ending1/ending2/ending3/ending4