I’ve spent decades living with Bullmastiffs who think the backyard is a giant playground — and occasionally, a subtle escape route. Over the years I’ve learned that an escape-proof plan is a mixture of solid fencing, attention to covert gaps, smart deterrents, and daily management. Below I share the practical solutions that have worked for me, whether you’re dealing with a young Houdini pup or a seasoned rover.
Start with the perimeter: fence types that actually hold up
Not all fences are created equal for large, powerful breeds. Bullmastiffs are strong, persistent and curious — they’ll test weak spots constantly. When selecting or upgrading a fence, I look at height, material strength and ground-anchoring.
Chain-link (8–6 gauge, 6–8 ft): Durable and affordable. I prefer a heavier gauge (6–8) and 8-foot height if possible. Chain-link can still be climbed or dug under without reinforcements.Wrought iron/steel panel (6–8 ft): Very strong and long-lasting. Choose panels with vertical bars close together to prevent squeezing or paws getting a grip for climbing.Stockade wood (6–8 ft): Offers privacy and visual barrier benefits. Use pressure-treated posts and horizontal bracing to resist leaning. Regular maintenance is needed.Composite fencing: Low maintenance and strong; good if you want a clean look plus durability.Whatever material you pick, I recommend a minimum 6-foot height. For especially agile or motivated escape artists, 7–8 feet is safer. I also ensure the fence posts are concrete-set at least 2 feet deep for stability.
Dig-proofing: stop the subterranean escapes
Digging under the fence is one of the most common escape tactics. My approach is physical and preventive.
Concrete footer: Dig a trench (around 18–24 inches deep, 12–18 inches wide) and pour concrete along the fence line. This is the most permanent solution.Fence skirts / apron: Attach 2–3 ft sections of heavy-duty welded wire or concrete pavers along the base on the dog side. Bury the wire outwards, creating an L-shape apron the dog can’t push up.Concrete pavers or patio stones: Place a continuous line of heavy pavers on the dog side of the fence to make digging awkward and uncomfortable.Chicken wire buried: For a budget fix, burying a roll of chicken wire horizontally under the fence can dissuade digging.Covert gaps and visual lines: where escapes hide
Small gaps around gates, fence posts and where panels meet are inviting. I walk the entire perimeter on hands-and-knees to find them.
Check for gaps at gate hinges and latch points — padding with metal flashing or rubber strips fixes many issues.Watch for overlap issues where two fence materials meet (e.g., chain-link to wood). Use metal plates or mount clear barrier strips.Inspect for ground erosion after storms — regrade and refill low spots before they become escape runs.Gates: the weakest link—reinforce them
Gates are the obvious weak point. I treat every gate like a security door.
Install heavy-duty latches with a secondary lock (slide bolt + padlock, or keylock latch). Avoid only plastic latches.Use a gate stop or wheel to prevent sagging; a sagging gate becomes easier to slip under or push open.Add a drop-in metal or wooden threshold to close the gap under the gate.Deterrents that actually work (and which to avoid)
Deterrents are helpful as part of a layered plan — never rely solely on them.
Motion-activated lights: Startle but not scare. Good for discouraging night-time attempts.Motion-activated sprinklers (Orbit, Havahart): Excellent for many dogs; a quick cold shower often breaks the habit. Test your dog — some will love the water.Scent deterrents: Commercial coyote-guard granules or predator urine mixes can deter some dogs, but Bullmastiffs tend to ignore scents if the reward is high.GPS trackers and invisible fences: Trackers (Whistle, Fi) give peace of mind but don’t prevent escape. Electronic boundary systems (Invisible Fence, PetSafe) can work for some dogs, but I never recommend them as the primary barrier for a powerful breed — they can escalate stress or be ignored by determined dogs.Training and management — the human side
The best fence is backed by training and environmental management. I combine management with targeted training exercises.
Boundary training: Teach a solid “back” or “stay” at the boundary line using high-value treats. Work at increasing distance and duration.Recall training: A reliable recall is lifesaving. Train indoors, then in the yard with distractions, and slowly build distance. Use extremely high-value rewards (boiled chicken, cheese) for practice.Reduce boredom: Many escapes start from boredom. Invest in durable toys (KONG Extreme, Goughnuts), puzzle feeders, sniffing mats and supervised play. Rotate toys weekly to keep novelty.Supervision: Never leave an untrusted escape-prone dog unsupervised for long. If you must, secure them in a run or indoor crate until you’ve fixed the perimeter.Behavioral causes: why they run
Understanding the “why” helps me design better prevention. Bullmastiffs may try to escape due to:
Boredom and pent-up energy — increase exercise before yard time.Mating drives — ensure intact dogs are managed, and consider earlier neutering where appropriate.Fear or reactivity — a dog that panics may bolt when seeing a stimulus outside (bikes, other dogs). In those cases I work with a behaviorist to desensitize and create safety cues.Hunting/curiosity — if your dog spots wildlife, the chase instinct can override everything; remove visual triggers if possible.Tools and products I use and recommend
Over the years I’ve found a few products reliably helpful:
KONG Extreme and Goughnuts chew toys — durable and mentally engaging.Orbit & Havahart motion sprinklers — cheap, effective deterrents for night and day.Stainless steel padlock + slide bolt for gates — simple, rugged gate upgrades.Whistle or Fi GPS collar — for tracking if an escape does happen (not a prevention tool).Troubleshooting common scenarios
If your Bullmastiff still finds a way out, do a systematic check:
Walk the perimeter during the same times your dog attempts escape — morning, dusk and night behaviours differ.Set up a camera (even a cheap Wi-Fi camera) to observe attempts. You’ll often discover a pattern or an unseen gap.If digging continues despite barriers, temporarily move the dog to a concrete run while you reinforce the fence permanently.For persistent leapers or climbers, add exterior overhangs angled inwards or solid visual barriers to remove a running start.Working with neighbours and the law
Talk to your neighbours — storms, stray animals or tempting smells often involve the surrounding environment. Make sure you know local fencing regulations and your liability if a dog escapes. When I’ve upgraded fences, I always checked local bylaws and discussed shared fences with neighbours first.
Designing an escape-proof backyard for Bullmastiffs is an ongoing process. You combine good hardware with daily routines, enrichment and training. When all these elements are in place, your dogs are safer, calmer and more content — and you get the peace of mind to enjoy them off-leash in secure settings.
