The dog trainer said she was reduced to tears as she watched Sully win
Ashleigh and Pudsey together won the British Got Talent in 2012, beating the Only Boys Aloud choir and the opera duo Jonathan and Charlotte.
The win saw the couple catapulted to fame, appearing on television shows and even 2.6 million box office hits, Pudsey The Dog: The Movie.
But Ashleigh was heartbroken by blood cancer after the death of his border collie in 2017.
Despite his heartache, the seasoned dog trainer competed in the Crufts weekend with six-year-old Sully.
The duo won the agility category last year and retained their title this year with another perfect performance in Birmingham.
Ashleigh said, "I just cried watching Sullivan's last win on the field again."
The competition saw the dog go through the agility race in just over 30 seconds - flying over obstacles and through tunnels.
And she added on Instagram: "What just happened." I am in shock. Win the singles for the third consecutive year, win the championships today for the second year in a row, but also win all THREE rounds today !!! !!!!
"I have so many thanks for coming to Sullivan for its incredible."