RE: area: parcel minus 5meters
Parcel range allows your cat to range up to the parcel boarders, horizontally, with no limits vertically.
The cat CAN exceed this setting if, at the end of its motion phase, when it switches from physical to non-physical (a trick which, once upon a time, but no longer, reduced Physics/Collision lag) if the center of the root prim is outside the range but the center of mass is not (say, it lays down before becoming non-physical). The problem is: if the cat is now off sim (or off parcel and subject to auto-return), it will be returned to your inventory. Once there, of course, it can't eat; so this is "Bad".
All other ranges are a sphere centered from the cat's Home position.
The Home position can be set to the cat's current position by a menu selection. Otherwise, the Home position is the point at which the cat was first placed in-world (either unboxed or brought in from your inventory).
The Range can be any number of whole Meters, within limits. Once upon a time you could set the range as low as 1 Meter, but this lower limit was raised to 3 Meters as a lag-fighting measure.
If, when switching from non-physical to begin a movement phase, the center of mass is inside a prim (say, a wall or floor) the object (linkset) becomes "temporarily non-physical, with respect to the cat" .. that is, the now-physical cat, since it BEGAN moving INSIDE the object does not "see" the object, at all. This can lead to the cat exceeding the range. A long, long time ago, I presented evidence of a cat moving several HUNDRED meters outside it range due to this "bug". I don't know what, if anything was, or can be done. Adding more prims, as suggested above, mitigates the problem but does not eliminate it. As with Parcel range, if the cat ends up outside the sim (or parcel) it becomes subject to auto-return.
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