Why watching training is so hard for her
To a young dog, training looks like the best game in the house — food appearing, toys moving, her favourite person animated and engaged — happening to somebody else. Frustration barking, lunging at the end of a lead and whining on a mat are not jealousy in the human sense, but they do show a dog who has not yet learned that exciting activity nearby is not her cue to join in. The skill is really two skills: a settle that holds under distraction, and trust that her own turn genuinely comes.
Build the mat rest where nothing competes with it
Teach the settle separately, in a quiet room, until lying on her mat and staying there while you move around is easy and well paid. Add small distractions in order — a toy placed on the floor, a family member walking past, food dropped at a distance — rewarding her for watching calmly and looking back at you. Only when that settle survives household distractions should the other dog appear, and the first sessions should have the older dog doing something deliberately dull, like calm hand touches across the room, not retrieves or tug games.
Run turns like clockwork: short, equal and predictable
Structure each session as visible rounds — the older dog works for two or three minutes while the youngster rests on her mat with a handler feeding calm rewards, then they swap. Predictability is the teacher: when resting reliably predicts that her turn is next, the frustration drains out of waiting. Keep her rest rounds slightly shorter than her working rounds at first, and if she breaks the settle twice in a session, the distance is too small or the other dog's exercise is too exciting — make the next round easier rather than correcting her repeatedly for a setup she cannot yet handle.
Pay the resting dog properly, not as an afterthought
The person managing the resting dog has a real job: delivering small rewards frequently for staying settled, especially in the moments the working dog earns something exciting. Use calm food rewards rather than thrown toys, keep your voice low, and occasionally reward extra generously when the older dog does something thrilling and the youngster merely watches. If she must be on a lead or behind a barrier at first, that is sensible management, not failure — fade the barrier as her settle proves itself over many sessions.
Protect the older dog's experience too
Turn-taking should also be fair to the veteran, whose training quality will suffer if a barking youngster steals her handler's attention or charges in mid-exercise. Keep enough distance that the older dog can work happily, and give her some sessions entirely alone with you — she earned undivided time long before the puppy arrived. Over weeks, the young dog's mat rest lengthens, the barrier disappears, and both dogs learn the household rhythm of working and waiting, especially when KinsLe Care Teams is used to assign who handles each dog in every round so the resting dog is never left unrewarded.