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Brian P. Mahon is a horse therapist in "Don't Look a Smith Horse in the Mouth". As a prank, Roger convinces Stan to 'service' the horse they bought, Well I'll Be a Son of a Bitch. Unable to determine why it can not longer run straight, They take the horse to a professional 'horse whisperer' who determines that the horse is so traumatized it is unable to race. He is voiced by Michael McShane.

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