A feeder with one bowl and one auger dispenses one portion. Two cats do not have one appetite. They differ in weight, age, activity and veterinary needs, and the machine cannot see which one arrived. Every multi-cat return starts from that gap.
There are three ways to build it, and only one separates the cats
The cheapest is a single bowl with one outlet. Both cats eat from the same pile, so the fast one takes the surplus and the slow one is short by roughly the same amount.
The second is a twin bowl. It stops the physical shoving, but it still dispenses the same portion on the same schedule to both sides. It solves crowding, not rationing.
The third is selective entry: the feeder opens only for the cat wearing the matching tag. That is the only arrangement where the two animals can be fed different amounts.
The tag is the hard part, not the door
Selective feeders read either a 134.2 kHz FDX-B implant or a 125 kHz collar tag. Those are not interchangeable, and a collar tag adds a collar, which a portion of cats will not tolerate. The reader also has a window: if the cat hesitates at the lid, the lid closes and the cat learns the machine is unreliable.
So the specification that matters is read range, read speed and how the lid behaves when a second cat is waiting directly behind the first. A feeder that reads well in a test and jams in a hallway is a mechanical problem, not a radio one.
When the two cats need two different foods
This is the case that makes selective entry non-negotiable. A renal or diabetic diet is not a preference; feeding it to the wrong cat is a clinical problem. In those households the feeder is not a convenience, it is part of the treatment, and the household needs one machine per diet or one selective machine.
Weighing tells you what actually happened
Volume-based dispensing reports what it dispensed. It does not report what was eaten, or by whom. A load-cell bowl reports remaining weight, which is the only way a portion-control claim can be checked at home without a kitchen scale.
For two cats this is the difference between "each gets 25 g" and "one ate 40 g and the other ate 10 g". The second sentence is the one that matters.
Timing alone does not separate them
Scheduling two meals does not help if one cat finishes in ninety seconds and the other grazes for twenty minutes. The grazer gets interrupted, the fast one sits at the machine and is fed twice by whoever feels sorry for it. A lid that stays open for a fixed window and a bowl that is visible from across the room both make this worse, because they turn the feeder into a place to wait.
The practical fix is behavioural before it is mechanical: place the machines out of sight of each other, or accept that timing guards portions and nothing else.
What to ask the factory
For a selective model, the questions are the chip standard it reads, the lid cycle rating, and what the warranty says about the motor and the lid, because those are the two moving parts and the two things that will be claimed. A selective feeder has an actuator in it and a collar to lose, so the spares and the tag price belong in the order.
What to buy
Two single-bowl machines in different rooms, separated by a door, is the cheapest working answer when the two cats are compatible and are fed the same food. A twin bowl is the right pick when the problem is crowding rather than diet. A selective feeder is the right pick when the cats need different portions or different food, and it is the one that should be sold with the chip frequency stated on the box.
Multi-cat is not a feature list. It is a question about how many separate appetites one machine has to serve.
The two-cat portion control guide sets out the feeding side of the problem, and the wholesale sourcing guide covers what to confirm with a factory before ordering. The pet feeder range lists the current models, and the pet feeder manufacturer page covers the selective-entry and weighing options we build.
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