In order to prevent tail injury in one dog you'd need to dock 500, according to research published in this week's Veterinary Record.

The study¹ was based on 138,212 dogs seen by vets at 52 veterinary practices across Britain between March 2008 and March 2009. 281 were treated for a tail injury - a rate of 0.23%, adjusted for sampling.

The owners of 224 of these injured dogs, as well as a random sample of 799 owners whose dogs had not been treated for tail injury were sent a questionnaire on dog tail injuries and docking.

Only 97 of the owners whose dogs needed treatment and 227 of those whose dogs had not been injured replied.

Their responses indicated that around one in three tail injuries (36%; 35 cases) had occurred at home as a result of the dog knocking its tail against a wall, kennel wall or other household object.

A further 17.5% (17 cases) were sustained outdoors, while 14.4% (14 cases) were caused by the tail being caught in a door. In 15 (15.5%) other causes were cited; and in 16 (16.5%), the cause was unknown. Almost half of the injuries (44%) were recurrent.

Over half the cases were treated with drugs and dressings, but in almost one in three cases, amputation was required. Eleven dogs did not need any treatment.

Certain breeds seemed to be more at risk, with springer and cocker spaniels almost six times as likely to sustain a tail injury as labradors and retrievers.

Greyhounds, lurchers, and whippets were almost seven times as likely to do so, possibly because of the lack of protective hair on their tails, say the authors. Dogs with a wide angle of wag were also almost four times as likely to be injured in this way, while dogs kept in kennels were more than 3.5 times as likely to sustain a tail injury.

Only 35 owners said their dogs had had their tail docked, and on the basis of their overall findings, the authors calculated that tail docking would reduce the risk of injury by 12%.

But in absolute terms, 500 dogs would need to have their tail docked in order to prevent one tail injury.

Reference
¹Risk factors for tail injuries in dogs in Great Britain. G. Diesel, D. Pfeiffer, S. Crispin, and D. Brodbelt. The Veterinary Record 2010 166: 812-817.

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