Rule 4 Deductions in Greyhound Racing

Rule 4 — What Happens When a Dog Is Withdrawn

A dog is declared to run. You study the form, assess the draw, and place your bet on another runner in the same race. Then, before the traps open, the declared dog is withdrawn — injury, illness, failed weight check, or a veterinary decision. The field is reduced, the competitive landscape has changed, and the odds on the remaining runners no longer reflect the original market. Rule 4 exists to address this imbalance. It is the mechanism by which your payout is adjusted to account for the removal of a runner that was priced into the market when you placed your bet.

Rule 4 — formally known as Tattersalls Rule 4(c) — authorises bookmakers to deduct a percentage from the winnings of bets that were placed before a runner was withdrawn. The deduction reflects the estimated impact of the withdrawal on the remaining runners’ chances. If a short-priced favourite is withdrawn, the remaining dogs are all more likely to win, and your bet at the original price overstates the value you should receive. The Rule 4 deduction corrects this by reducing your payout in proportion to the withdrawn dog’s price at the time of withdrawal.

Rule 4 applies to bets placed before the withdrawal was announced. If you place your bet after the withdrawal is declared and the market has adjusted, no deduction applies — you are betting into a market that already reflects the reduced field. The timing of your bet relative to the withdrawal announcement determines whether the deduction affects you, which is why late betting — placing your bet close to the off, after the final market movements — can sometimes avoid deductions that catch earlier bettors.

The Tattersalls Deduction Scale

The size of the Rule 4 deduction depends on the price of the withdrawn runner at the time of withdrawal. The Tattersalls scale specifies the deduction percentage for each price band, ranging from a maximum of 90p in the pound for a very short-priced withdrawal to zero for a runner at long odds. The relationship is intuitive: the shorter the withdrawn dog’s price, the greater the impact of its removal on the market, and the larger the deduction.

The standard Tattersalls deduction scale operates in bands. A withdrawn runner at odds of 1/9 or shorter triggers a deduction of 90p in the pound. At 2/11 to 2/17, the deduction is 85p. At 1/4 to 1/5, it is 80p. At 3/10 to 2/7, it drops to 75p. At 2/5 to 1/3, it is 70p. At 8/15 to 4/9, 65p. At 8/13 to 4/7, 60p. At 4/5 to 4/6, 55p. At 20/21 to 5/6, 50p. At evens to 6/5, 45p. At 5/4 to 6/4, 40p. At 8/5 to 7/4, 35p. At 9/5 to 9/4, 30p. At 12/5 to 3/1, 25p. At 16/5 to 4/1, 20p. At 9/2 to 11/2, 15p. At 6/1 to 9/1, 10p. At 10/1 to 14/1, 5p. At over 14/1, no deduction applies.

The deduction is applied to your winnings, not your total return. If you placed a £10 win bet at 3/1 and a Rule 4 deduction of 15p in the pound applies, your gross winnings would have been £30 (3 x £10). The deduction is 15% of £30 = £4.50. Your adjusted winnings are £25.50, and your total return including your stake is £35.50 (£25.50 + £10 stake). The deduction reduces your profit but does not touch your original stake.

In greyhound racing, Rule 4 deductions are less common than in horse racing because the fields are smaller — six dogs rather than twelve to twenty horses — and the volume of late withdrawals is lower. When they do occur, the deductions can be significant because greyhound fields are compact: a withdrawn favourite in a six-dog race has a larger proportional impact on the remaining field than a withdrawn favourite in a twenty-runner horse race. A 4/5 favourite withdrawn from a six-dog field triggers a 50p deduction, halving the winnings on your selection.

How Rule 4 Affects Your Payout — Worked Examples

Consider a six-dog greyhound race where you have backed Trap 3 at 5/2 for £10. Before the race, the Trap 1 dog — the 6/4 favourite — is withdrawn. A Rule 4 deduction of 40p in the pound is applied. Trap 3 wins the race. Your gross winnings would have been £25 (5/2 x £10). The deduction is 40% of £25 = £10. Your adjusted winnings are £15, and your total return is £25 (£15 + £10 stake). Without the deduction, your return would have been £35. The difference — £10 — is the cost of the withdrawn favourite’s removal from the field.

Now consider the same race, but the withdrawn dog was the Trap 6 outsider priced at 12/1. The Tattersalls scale prescribes a deduction of only 5p in the pound for runners between 10/1 and 14/1. Your bet on Trap 3 at 5/2 settles with a minimal adjustment — a 5% reduction on your £25 winnings, or £1.25 — leaving adjusted winnings of £23.75 and a total return of £33.75. The withdrawal of a long-priced outsider has a negligible effect on the remaining runners’ chances. For runners priced at over 14/1, no deduction at all is warranted.

For each-way bets, the deduction applies separately to both the win and place components. If your each-way bet on Trap 3 at 5/2 for £5 each way (£10 total) encounters a Rule 4 deduction of 40p, the win winnings of £12.50 are reduced by 40% (= £5), and the place winnings (assuming 1/4 odds for placing, = £3.13) are also reduced by 40% (= £1.25). The total deduction across both parts is £6.25, which reduces your combined return accordingly.

For accumulator bets, the Rule 4 deduction is applied to the affected leg, and the adjusted odds for that leg are carried through the accumulator calculation. If one leg of a four-fold accumulator encounters a Rule 4, only the winnings from that leg are reduced. The remaining legs are unaffected, and the accumulator settles on the adjusted returns.

When Rule 4 Doesn’t Apply

Rule 4 deductions do not apply in several circumstances. Understanding these exceptions prevents unnecessary concern and helps you assess the real impact of a withdrawal on your betting position.

If you place your bet after the withdrawal is announced and the market has been reformed, no deduction applies. The reformed market already reflects the reduced field, and the prices you bet into account for the missing runner. This is the simplest way to avoid Rule 4: bet late, after any withdrawals have been declared. The trade-off is that late prices may be less favourable than early prices on your selection, but they come without the risk of a post-withdrawal deduction.

If a reserve runner replaces the withdrawn dog, Rule 4 may not apply — or may apply at a reduced rate — because the field still contains six runners. The competitive impact of the withdrawal is mitigated by the replacement, and the deduction is adjusted or removed accordingly. Whether a replacement nullifies the Rule 4 depends on the timing of the replacement and the specific bookmaker’s rules, so check with your operator if a reserve is declared.

Tote bets — pool bets placed through the tote — handle withdrawals differently from fixed-odds bets. In a tote pool, the money staked on the withdrawn dog is typically returned to those bettors, and the pool is recalculated without that money. No Rule 4 deduction applies to tote bets because the pool mechanism adjusts the dividends automatically to reflect the reduced field. This is one of the structural advantages of tote betting in situations where late withdrawals are a risk.

Starting price bets placed at SP rather than at a fixed early price are also unaffected by Rule 4, because the starting price is determined after the withdrawal and reflects the market without the missing runner. The SP already incorporates the impact of the withdrawal, so no additional adjustment is needed.

A Cost of Doing Business at the Dogs

Rule 4 deductions are an irritation rather than a catastrophe. They reduce your winnings on a bet that you would otherwise have won at the full price, and they occur infrequently enough that most greyhound bettors encounter them only a handful of times per season. But when they do occur — particularly when a short-priced favourite is withdrawn and the deduction is 50p or more in the pound — the impact on a winning bet is substantial and can feel disproportionate.

The correct response is to accept Rule 4 as part of the betting landscape. The deduction exists because the withdrawal changed the competitive conditions under which your bet was placed, and without the adjustment, your payout would overstate the value of your selection in the revised field. It is a fair mechanism applied to an unfair situation, and while it is never pleasant to see your winnings reduced, the alternative — no adjustment and an overpayment that the bookmaker absorbs — would ultimately be reflected in less competitive odds across the board.

If Rule 4 deductions are a recurring concern, the practical mitigations are straightforward: bet late to avoid being caught by post-bet withdrawals, take SP rather than early prices when you suspect a withdrawal is possible, or use the tote for races where non-runners are a known risk. None of these strategies eliminate the risk entirely, but they reduce your exposure to a mechanism that, in the context of a full season of greyhound betting, is a minor cost of doing business.