Attack Cat strikes again, twice!

I am a retired Letter Carrier and saw one big cat like that in 36 yrs of delivering mail. I had never seen a cat that acted like a watchdog and was ready to attack because usually they will run away to avoid confrontation. I was walking delivering mail door to door when a big cat like yours stood his ground and would not let me on the porch. He bared his teeth with its back hair on end while screaming a cat growl. To me it was more frightening than a dog and the customer of that house got no mail that day. I told some guys at work about it and they did not believe me. Personally I don't like cats as they seem to have a mind of their own and are sneaky but I do love dogs.