Magnum, P.I. (1980)

S1E8 The Ugliest Dog in Hawaii

Higgins enlists Magnum to protect a valuable socialite's quarantined pooch following a failed dognapping attempt. Sir Algernon Farnsworth quickly becomes Hawaii's most sought-after dog as his previous owner, the aging mobster Victor DiGiorgio, is determined to reclaim him. With the stakes high, Magnum must navigate the challenges of safeguarding the quirky canine from those who wish to take him back.