Humphrey recruited a massage therapist and chiropractor for the border collie after their act impressed the judges at the auditions earlier this year, The Sun claims.
Chandi is also said to be following a strict new diet to boost her chances of success in the contest.
Humphrey confirmed: "She's on an organic raw food diet - she's an athlete after all."
A source added: "Simon Cowell has made no secret about wanting a talented dog to win.
"Tina thinks Chandi's the one to do just that - and she isn't holding back on doing whatever it takes. But she knows that some of her methods might seem to be verging on the ridiculous."
Britain's Got Talent continues tomorrow at 8pm on ITV1.