Size each reward for repetition, not for a meal
A training session runs on repetition — a behaviour offered, marked and rewarded dozens of times — so each reward has to be small enough that your rat can eat it in a couple of seconds and look up ready for the next rep. Aim for pieces about the size of a pea, or smaller: a single oat flake, a sliver of banana, a tiny cube of cooked pasta, a fragment snapped off a larger treat. Soft foods win over crunchy ones here, because a rat who has to sit and grind through a hard chunk loses the thread of the lesson, and a lick of something soft from your fingertip — a smear of mashed banana or cooked sweet potato — can reward him with almost no chewing time at all.
How the ten minutes should add up
Across the whole session, the pieces should total roughly a level teaspoon of food — a couple of teaspoons at the very most for a large adult rat working on something difficult. That sounds like nothing, and that is the point: training treats sit on top of the day's normal meals, and a rat who ends a session genuinely full has been paid in dinners, not rewards. If you train daily, take the session's worth out of his regular food allowance — measure the day's food in the morning, set the training portion aside in its own little dish, and the day's total stays honest without any extra food creeping in.
Treats that earn their place
Rotate two or three rewards within a session so interest stays high: something soft and fragrant for a difficult new behaviour, something plainer for easy reps he already knows. Cooked peas, tiny pieces of cooked egg, and small shreds of plain cooked chicken all break down to rat-sized rewards, and a single blueberry quartered gives four high-value payments. Avoid sticky foods that cling to the roof of the mouth, anything heavily salted or spiced from your own plate, and chunks big enough to carry off — a reward he has to transport is a reward that ends the rep. Whatever you choose, prepare the whole session's pieces before you start: breaking food up mid-session with treat-scented hands turns you into the puzzle instead of the teacher.
Reading the rat: when the treats stop working
Your rat will tell you when the portion has passed plenty. A rat who starts carrying rewards away to stash in a corner has shifted from eating to storing — his stomach is no longer voting. Slower taking, turning the head away, or pausing to wash his face mid-session all say the same thing: the food has lost its value as pay. End on an easy win there rather than pushing on with bigger bribes, and look at what is left in the dish — the uneaten amount is part of tomorrow's calibration. Fresh water should be within reach throughout, since a mouthful of dry rewards makes any rat thirsty, and a thirsty rat stops learning to go and drink.
Marking the session complete on your rat's KinsLe Care Teams duty list, with the treat amount jotted against it, keeps the day's food honest across the household — nobody else tops him up with a second round of treats because the training already happened.