He was wrestled to the ground by a number of security guards and was escorted away.
"We are not sure what we are going to do with the dog yet as she's only two-and-a-half, so we'll see when we get home".
An intruder in the showring was wrestled to the ground by security officers after the victor was announced.
The Best in Show award was the culmination of Crufts, a four-day event which attracted nearly 21,000 competitors.
It marked an even more successful year for the pair, who triumphed in the Best of Breed category in 2017 and was reserve best in group for the Hound dogs.
A protestor is carried off after running into the area as Best In Show was being announced on day four of Cruft's.
Eyewitnesses said he was carrying a banner displaying the name of the animal rights group Peta (People for the Ethical Treatment of Animals).
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That made it a Crufts to remember for her 61-year-old owner Janis, of Chadderton, who joined thousands of other canine lovers in descending on the West Midlands for 127 edition of the world's largest dog show.
As the man ran towards Ms Short she grimaced, picking up the dog and holding the dog close to her.
A Crufts spokesperson said the intruders "scared the dogs and put the safety of both dogs and people at risk in a hugely irresponsible way".
Crufts and the NEC said security would be reviewed as "a matter of urgency".
PETA UK tweeted a clip of the stage invasion a few hours later, claiming activists were protesting against "extreme breeding".