The owners of a prize-winning Irish Setter that died after competing at Britain's renowned Crufts dog show have claimed the animal was poisoned.
Thendara Satisfaction, who was known as Jagger and was almost four years old, was second in his class at the event in the English city of Birmingham on Thursday.
The dog died after returning home to Belgium, 26 hours after leaving the event, a spokeswoman for Crufts operators The Kennel Club said.
"We have spoken to his owners and our heartfelt sympathies go out to them," the spokeswoman said.
"We understand that the toxicology report is due next week and until that time we cannot know the cause of this tragic incident."
Co-owner Dee Milligan-Bott wrote on her Facebook page that Jagger had been killed by being fed cubed beef with poison "stitched into the meat".
"This resulted in a very painful death for our beautiful boy," Milligan-Bott wrote.
"The timings from the autopsy make it clear the only place this could have been given to Jagger was while on his bench at Crufts. The police have been informed."
Almost 22,000 dogs compete at Crufts, which was founded in 1891 and is something of a British institution, including almost 3000 entrants from abroad.
An increased influx of foreign dogs had raised concerns that underhand tricks such as drugging competitors' dogs or putting chewing gum in its coat could become more common.
Prize money at the event is paltry, with just 100 euros ($A140.50) awarded for best in show, but owners of winning dogs can make a lot of money from breeding.
The four-day event concluded Sunday with the Best in Show competition, which was won by a US-bred and Russian-owned black Scottish Terrier called McVan's to Russia With Love, known as Knopa.
As Knopa and handler Rebecca Cross posed by their gleaming silver trophy, a protester ran onto the arena and held up a "Mutts against Crufts" sign and the name of animal rights group PETA.
People for the Ethical Treatment of Animals opposes Crufts as it says that selective breeding for physical traits causes dogs to develop medical and genetic problems.
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