Quote:
Originally Posted by Sailor Tony B 
All of the models and plans I saw were very generic. I feel that a cat house should be custom tailored for the owner, no different than how we buy clothing to fit us comfortably and safely. Cats just like that sense of security in a well protected place that they can defend if they had to and an opening that they can easily get in and out of, yet small enough to prevent larger intruders from entering.
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If you're talking about bird houses, yes, the opening has to be very specific dimensions for the species.
But with cats, that vary in size from 6lb Singapuras to 20lb Maine Coons, its not really that critical and not a strong instinct to follow like in birds. My cats sometimes chill under the couch, which they can barely squeeze their bodies into, and other times prefer a completely open perch, and other spots are different size openings from their enclosed beds, to the chair cushion under the table, to their condos.
I have never read anything about any "perfect" size for an opening, but some cats prefer two exits (front and side) from an enclosure so that they can't be cornered and can bolt.