Oh, poor kitty.

My boyfriend's cat is in a similar state. It is old, deaf, and blind. They keep it inside, but once in a while it gets out and is so confused. The cat was once lost for a weekend in the back yard. It couldn't find it's way home. On a second occassion, it even wandered to a different neighborhood. A family found him and posted signs immediatey.

If you are not telling your neighbor when you almost back over their cat, they may not know that it is sleeping under the tires of cars and in the street. I don't think it would hurt to express your concern for their poor senile cat. If they love it, they would want to know what's going on. Just be careful what you say. You do not to make it seem that you think they are being neglegent in any way. Something should be done, the poor cat is probably so scared and confused. It really needs to be inside or in a fenced in yard.