A small terrier built to go to ground
A West Highland White Terrier follows its nose and its history under the fence. Westies were bred to pursue quarry into rocky dens and earthworks, so a gap at the base of a fence is not an obstacle but an invitation, and this sturdy little dog digs with purpose and speed. Escapes usually start quietly, under a bush or behind a shed, and are discovered only when a white terrier is already trotting down the street following the next scent.
Audit the boundary at ground level, on hands and knees if needed. Look for the terrier's favourite starting points: soft soil near fence corners, gaps under gates on gravel, spaces where a fence crosses a slope, and any opening into the void under a deck, shed, or raised outbuilding. A Westie who gets under a deck inside the yard can emerge outside the fence line through a second gap you never knew existed, so those under-structures count as part of the boundary.
Sealing the base against digging
The fence base for a West Highland White Terrier needs a buried defence. Dig a narrow trench along problem sections and bury mesh or a solid barrier below the fence, or lay a mesh apron flat on the ground inside the boundary, pinned and covered, so the first dig meets resistance while the dog is still at the surface. Backfill scrapes with compacted soil, and place pavers over persistent hot spots such as the corner where squirrels run, because a Westie will reopen a successful hole from memory.
Under gates, fit a board or brush that keeps clearance smaller than the dog's head, and recheck it whenever gravel shifts or soil settles after rain. Around sheds and decking, fix mesh or boards across every access gap at ground level, leaving no dark opening a terrier can slip into. Check compost heaps and log stores pushed against fences as well, since both hide digging and provide a step that raises a small dog toward the top of a low section.
Doors, prey drive, and garden supervision
A West Highland White Terrier will also bolt through an open door after a cat or a bird with no pause for traffic, so keep an inner barrier or closed door between the dog and entrances during arrivals and deliveries. Teach a wait at internal doors with tasty rewards, and use a lead in the garden while base repairs are under way or when wildlife is unusually active beyond the fence. Supervision matters more for this breed than for many, because digging progress is silent and often hidden by planting.
Give the terrier legal work for its instincts. A digging pit in a chosen corner, scent games with treats hidden in grass, and short training sessions redirect the drive that would otherwise be spent at the fence base. Rotate toys and end garden time before frustration builds if neighbouring activity is winding the dog up, since a Westie rehearsing fence-line arousal daily will eventually convert it into an escape attempt.
Identification suited to a dog who travels low
Keep microchip details, collar identification, and recent photos up to date, remembering that a white coat shows mud quickly and a freshly dug-out Westie may look grey by the time anyone sees her. Choose photos that show the dog clean and full-body, and note the ear and tail carriage that help distinguish one small white terrier from another.
If your West Highland White Terrier digs out despite a sealed base, KinsLe's Lost Pet Alert System can let nearby members know a small white terrier is missing locally, and a finder can message you directly through the alert while you check under sheds and decks along the likely route.