According to an independent Preferred Results Ltd report commissioned by Greyhound Racing Ireland in 2017, over 83% of the racing greyhound pool in the UK originates in Ireland.
The report also states that racing greyhounds ‘are exported to the UK, for prices that are less than 50% of their actual production cost’
https://www.grireland.ie/globalassets/talking-dogs/pr/preferred-results—igb-organisation-restructuring-report—pages-1—65-compressed.pdf.
However a more recent article published in Greyhound Star on 10th July 2020 states that ‘around 90% of UK racers are Irish bred.’ According to the same article, the ‘total number of matings (in Ireland) for the first six months of the year’ has dropped ‘to 1,195 from 1,588’. That represents a 30.4% decline with no immediate likelihood of an upturn.’
http://greyhoundstar.co.uk/greyhound-breeding-freefall/
The Irish greyhound racing industry’s reputation in relation to the doping of greyhounds is well established. Greyhounds in Ireland have tested positive for cocaine, barbiturates, ketamine, Viagra, cannabis, beta-blockers, Ritalin, and morphine – to name just a tiny number of the substances found.