Home turf is not toilet turf for many dogs
Your garden, to your dog, is home ground: the place he rests, plays, watches the fence line and spends relaxed hours near his family. Many dogs naturally prefer to eliminate away from the core of their living space, just as they would move away from the den area. A walk offers the opposite conditions. Movement itself helps the gut along, novel smells prompt marking and toileting, and verges carry messages from other dogs that make a spot feel like a designated place. So his request to go out is not manipulation. He has a genuine preference, built from territory instincts, exercise and scent, and by now it is also a well-worn routine his body expects.
How the walk-only habit gets locked in
Habits harden through consequences you may not have noticed. If toileting in the garden as a puppy meant the fun ended and he was brought straight inside, he learned that holding on keeps life interesting. If a walk reliably follows breakfast and he toilets ten minutes in, his body has set its clock to that sequence. Some dogs also dislike the garden surface, perhaps because it is a hard patio where they prefer grass, or because the lawn feels exposed under a neighbour's window. Others were once startled outside at night by a noise or a cat and quietly decided the garden after dark is not a relaxing place to be vulnerable. The cause matters less than the pattern: walk equals toilet, garden equals everything else.
Teaching the garden as an option, step by step
You do not need to remove walks; you need to add the garden as an accepted alternative, which matters for late nights, illness and stormy weather. Take him into the garden on a lead at the times he would normally toilet, walk the perimeter slowly as you would on a street, and wait without playing or chatting. If he goes, praise warmly and then still give a short walk or garden game, so toileting never ends the fun. Borrow scent help by walking him first to his usual verge, then on the next outing trying the garden before the walk. Keep sessions brief and unpressured; standing over him willing him to perform adds tension that delays exactly what you want. On very wet nights, a lead walk around the garden under an umbrella, following his usual verge routine in miniature, can persuade him when a quick unsupervised trip out clearly will not.
When a walk-only dog needs a health check
A long-standing preference is one thing; a sudden change is another. If a dog who happily used the garden now refuses, strains, asks to go out far more often, or seems uncomfortable when he does toilet, treat that as new information and book a vet visit rather than assuming behaviour. Pain, tummy upsets and urinary issues can all make a dog seek different places or need more urgent trips out. Note how frequency and urgency have changed and whether night-time requests are new. KinsLe keeps that timeline together because Care Teams lets everyone who walks him record garden attempts, walk successes and any straining in one shared log, making a recent change easy to describe accurately.