Behaviour

Crib-biting, weaving and box-walking: what they mean for a buyer

Stable vices are welfare signals, not character flaws. What causes them, which ones affect health and resale, and when they should change your decision.

•6 min read

The short answer

Crib-biting, wind-sucking, weaving and box-walking are stereotypies: repetitive behaviours that develop in response to stress, isolation or too little forage, usually early in life. They are not learned by copying and they cannot reliably be trained out. For a buyer they matter in three practical ways — crib-biting is associated with a raised risk of some colics and wears the incisors, most livery yards ask about them and some refuse them, and they reduce resale value regardless of how well the horse works.

The word "vice" is a hangover from a time when these behaviours were read as bad character. They are better understood as stereotypies — repetitive behaviours with no obvious function that develop when a horse's environment does not meet its needs. That reframing matters when you are buying, because it tells you where to look: not at the horse's temperament, but at how it has been kept.

What are the main ones?

  • Crib-biting: the horse grips a solid edge with its incisors, arches its neck and draws air in with an audible grunt. Wind-sucking is the same behaviour without gripping anything.
  • Weaving: shifting weight rhythmically from one front foot to the other, swinging the head and neck, usually over a stable door.
  • Box-walking: circling the stable continuously.
  • Door-kicking, rug-chewing and pawing: usually anticipatory behaviours around feed times rather than true stereotypies, and generally more responsive to management change.

What causes them?

The consistent findings across research are the same handful of factors: long hours stabled, limited forage, high-concentrate feeding, weaning stress, and lack of social contact with other horses. A horse evolved to graze and move for most of the day, in sight of others. Stereotypies develop where that is furthest from possible.

Do they affect the horse's health?

Crib-biting is the one with a real evidence base behind the concern. It is associated with an increased risk of certain colics — epiploic foramen entrapment in particular — and it wears the incisors abnormally, which over years affects grazing and makes ageing by teeth unreliable. Some crib-biters also lose condition around feed times.

Weaving and box-walking are less clearly linked to specific disease, but both burn energy, both can make a horse hard to keep weight on, and box-walking in particular can contribute to uneven hoof wear. All three are signs that the horse finds confinement difficult, which is a management fact you will inherit.

Can they be stopped?

Not reliably, and physically preventing them is now widely regarded as poor welfare practice. A cribbing collar or an anti-weave grille removes the behaviour without removing the underlying stress, and the behaviour usually returns the moment the device does not.

What does help is management: more turnout, more social contact, forage available for more of the day, less concentrate feed. A horse that crib-bites for ten minutes after its hard feed and then goes out for eight hours is in a very different situation from one that cribs for hours in a stable. When you view, ask how much of the day the horse spends out, and watch what it does when the yard goes quiet.

How should it change what I pay?

Stereotypies reduce value — often noticeably — because they narrow the pool of future buyers and yards. That cuts both ways: you may be looking at a genuinely good horse at a lower price because of a behaviour that your own management would improve.

  1. Check your yard will accept it. Ask before you buy, not after. Some yards refuse crib-biters outright; some charge for stable damage.
  2. Check your insurance. Some policies exclude colic in a known crib-biter, which is the exclusion that matters most.
  3. Look at the horse's routine, not just the horse. If it currently lives out and does not crib, ask what happens when it is stabled in winter.
  4. Expect it to persist. Buy the horse you are watching, on the assumption the behaviour comes with it permanently.
  5. Price it in. It is a legitimate reason to negotiate, and it is a legitimate reason to buy — as long as the decision is deliberate.

Does it have to be disclosed?

In the UK, sellers acting as a business must not give a misleading description, and a stereotypy is the kind of fact a buyer would want to know. In a private sale the obligation is narrower — the horse must match its description, so a direct question that gets an untrue answer is far stronger ground than silence in an advert.

So ask it directly, in writing: does this horse crib-bite, wind-suck, weave or box-walk, now or at any time in the past? Keep the answer. A message saying no is worth a great deal more than an advert that simply does not mention it.

Common questions

Not automatically. It is a permanent management and resale consideration and it carries a raised risk of some colics, so it should reduce the price and it must be accepted by your yard and understood by your insurer. Many crib-biters have long, sound, useful careers.

The evidence does not support learning by imitation. What appears to spread through a yard is usually the shared management — long stabling, restricted forage, limited turnout — that causes the behaviour in several horses at once.

Physical prevention is increasingly regarded as poor practice because it suppresses the behaviour without addressing the stress behind it, and can cause distress in itself. Increasing turnout, forage and social contact addresses the cause; devices only address the symptom.

Only by chance. A vetting is a few hours at the seller's yard, and a horse may not crib or weave in that window — the vet will note worn incisors if they see them. This is one of the things you have to ask about directly rather than expect an examination to reveal.

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Stirrup is a screening tool, not veterinary advice. Always commission an in-person Pre-Purchase Exam before buying.