[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. 
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.