An intruder in the showring was wrestled to the ground by security officers after the winner was announced.
Nearly 21,000 dogs competed for just seven places in the show’s finale - where each of the individual groups were represented.
Dog breeders were battling it out over four days for the top prize at the world’s biggest dog show.
There were 9,000 people crammed into the NEC Arena in Birmingham to watch the winner be chosen.
Crufts organisers, the Kennel Club, said they could not confirm if it was a protest of some kind and added they are “looking into the incident”.
It happened a day after West Ham United’s security was called into question after a series of pitch invasions and widespread supporter unrest.