You open the back door and call your dog. They glance at you, then go back to patrolling the fence line or digging up a corner of the lawn. Ten minutes later you are still standing there in the cold.
Your dog is not being selective. Coming inside reliably means the garden, the smells and the freedom all end, and nothing waiting indoors competes with that.
Why calling repeatedly makes it worse
Every unanswered call spends the word for nothing. If your dog is deep in a smell and you already know they will not come, walk over instead of calling.
Stop calling the moment you know you will not get an answer. Walk toward your dog instead, or wait for a moment they are already heading your way.
Make coming in pay, starting today
The answer is not a louder voice. It is making the doorway worth walking through, which takes deliberate practice rather than hope.
Carry treats in a pot by the back door, and pay every time your dog comes in for 2 weeks. Pay the times they would have come in anyway.
Call once, in a bright voice, and open your arms rather than standing still and repeating. Feed 3 treats as soon as they arrive at the door, not after they are through it.
Release your dog back outside on 3 or 4 of every 5 recalls, so coming to you does not always mean the fun stops.
Coming in only to be met with a bath, nail clipping or crate time will teach your dog to avoid the door. Save those for a separate moment, well after the recall has been paid.
Tonight, 6 minutes, in the garden itself
Let your dog out to sniff for 2 minutes with no agenda. Interrupting immediately just teaches them the garden ends the moment you appear.
Call once from the doorway. When they arrive, feed 3 treats one after another, then send them straight back out with a cheerful word.
Repeat 5 times, finishing on a round where you actually bring them in, fed at the door and straight to a chew inside.
The chew at the end matters. It gives indoors something to offer in the first minute, rather than asking your dog to trade the garden for nothing.
If your dog is patrolling rather than playing
Some dogs are not enjoying the garden so much as guarding it, pacing a fence line or barking at next door. That is a different problem, and it is answered by blocking the view along the fence rather than by a better recall.
Put a temporary screen or planting along the section of fence your dog patrols hardest, if that is practical where you live.
Shorten unsupervised garden time to short, timed spells for 2 weeks, and go out with them instead. Patrolling then has less time to become a habit.
Safety note
Some fence behaviour is not ordinary. A dog who cannot be called away, and is also stiff, staring hard, or barking at one specific person, needs help. Speak to a veterinarian and a qualified behaviour professional. Sudden reluctance to come in, over days rather than weeks, is also worth a veterinary check.
Today's version, in one line: treats by the door, one call, and send them back out 4 times out of 5.