Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose and treat blood clots in cats [title] Notice if your cat is having trouble walking or moving its legs. [step] In many cases of blood clots in cats, the clot eliminates blood flow to the back legs. This makes it impossible for the cat to move its back legs.

Ending1: For example, some cats use their legs during non-surgical tasks, which they then must do normally. Symptoms of blood clot is : [substeps] Slowness of gait inability to sit upright persistently needing surgery pain during surgery and/or limping [title] Be aware of genetic causes of blood clot formation. Ending2: If you notice that your cat can't walk all of a sudden, take it to a veterinarian immediately. [substeps] This inability to walk can begin with abnormalities in the cat's gait or lameness. Ending3: [substeps] Often, the blood merely runs down a healthy vein across the back of the legs, though sometimes the vein is infected by this clot. Most, if not all the blood gets flowing through the clot, the clot will become so inflamed that the cat cannot walk. Ending4: In contrast, cats who have blood clots in their back legs may have difficulty moving their feet at all. [substeps] Blood clots are most commonly caused by blockage of blood vessels by swelling in affected areas.

Answer format: ending1/ending2/ending3/ending4