LaDainian Tomlinson: I'm The Dogfather Of The NFL ... My Pet Resort Is BOOMING

LaDainian Tomlinson's career has totally gone to the dogs since he retired from the NFL ... 'cause the future Hall of Famer says he's now a first ballot pup groomer.

LT was leaving LAX when we asked about his newfound commitment to canines ... a "pet resort" he opened up in San Diego towards the tail end of his playing career.

Tomlinson proceeded to talk Lassies and Fidos like they were x's and o's ... saying his resort is frequented by TONS of NFL guys ... and that things are going so well he's thinking about expanding the business to L.A.

Bonus wisdom ... he tells all the thirsty guys out there exactly which dogs you need to get the best reaction from chicks.