HEART RUMBLE's positive sample following his run in the Northern Puppy Derby at Sunderland last year - which on Tuesday led to his Irish trainer Paul Hennessy being severely reprimanded and fined £800 by the NGRC - came about after he was treated for kidney problems.

In a written statement, Hennessy explained that the dog had suffered renal failure and had been administered `laurabolin' by his veterinary surgeon in November 2004. He apologised to the Stewards for the positive sample, which was found to contain the banned substance nandolone, and stated that every precaution would be taken in future to ensure that there would be no recurrence.

In other inquries this week, greyhound trainer Stan Dow had his license withdrawn following the positive analysis of a urine sample taken from Billis Picture at Peterborough in November; while former trainer Dean Steward was fined £1,000 and made a disqualified person for failing to look after greyhounds in his care.

Romford handler Kim Marlow was fined £750 and severely reprimanded after the positive sample taken from Charity Case at the Essex track in November, while Sittingbourne handler George Andreas was fined £1,000 after the positive sample taken from Ill Get Him at the Kent circuit in January.

In a separate inquiry, the racecourse executive at Brough Park was fined £750 and reprimanded after Pocket Rocket ran as Pocket Power at the north-east track in January.

"We once had a dog run at Sittingbourne and, from what I saw, the Owners Association and re-homing scheme were non-existant.......... I am sure Sittingbourne is not an unusual track.... it is the norm."