Thousands of retired racing greyhounds are potentially being culled every year, according to a parliamentary report.
The Environment, Food and Rural Affairs Committee warns that between 1,000 and 3,700 dogs are unaccounted for each year.
Although some may have stayed with their owners others may have been killed, according to the report, which urges the industry to be more transparent about the dogs’ fate.
MPs have now called for bookmakers to pump more cash into the animals’ welfare with the introduction of a Government levy.
Committee member Jim Fitzpatrick said: "We simply do not know what is happening to all greyhounds after they finish racing.
“If the destruction of healthy dogs is happening on a large scale it is clear that the industry should bear a greater financial responsibility for funding rehomed greyhounds.
“We want to see that all efforts are being made to re-home these animals at the end of their racing lives."
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