ID-20 and parallax key RFID, will they work together?

I’m thinking of doing a electronic cat door(skunk got in last night). I was thinking of doing the ID-20 for range, and Parallax key RFID tags for smallness/easy to attach to collar. Will they work together?

Any idea about range?

I just ordered the ID-20 from Sparkfun and the parallax cards. Haven’t gotten them to work together yet but I am not sure its the cards fault. If anyone has been successful with this combination, I would like to know. It would help me troubleshoot.

They work great. I get a range of about 3" which is better than most readers I have used (work, school, etc).