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Q: Do i need to know my cats microchip number for this to work? I don't know where the microchip paperwork is. How would i find that number?

You do not need to know the number. You do not enter the number manually. During setup you just have to get your cat close enough for the door to read the number, and then it will be stored. However if you would like to know the microchip number for your records, you can take your cat to your vet (or any vet, really) and ask them to scan her chip and write down the number for you (I'm a vet tech--we do this all the time). Hope that helps. If you have any more questions I'm glad to help. I love this cat door and so does my cat!!

Q: Can anyone tell me what the dimensions of the actual flap are?

The overall dimensions are 8 1/2" high and 8 1/2" wide; the flap is 5" tall and 5 1/2" wide.

Q: How close does the cat have to get before the door unlocks? Any problems with it not opening?

I think my SureFlap door would click open when my cat put his head about 2 inches from the door. And no, I never had any problems with it not opening. But mine is in the trash because the raccoons kept going thru it to get to the cat's food and after awhile the cat wouldn't use it any more. Be sure to get the raccoon-proof model, if you buy it! It was a good idea but mine turned out to be a waste if money.

Q: Has anyone had problems with their cat(s) being to large to fit through hole? And, if so, are there other sizes for this product?

I just received this door and it is significantly smaller than the "Tubby Cat" door we currently have, which has a 10 x 7 flap opening. The SureFlap opening is 4.7 x 5.6 inches (I converted from the millimeter size on the box). One of our cats has to take medication that caused her to get heavy and she would never fit through the SureFlap. I will return this door and order the Pet Door, which is suppose to accommodate large cats and small dogs.