Snoop Dogg isn't the only canine with a nose for weed ... TMZ has learned the rapper was ARRESTED in Texas this weekend after a drug-sniffing dog uncovered marijuana on his tour bus.
Law enforcement sources tell us ... Snoop's tour bus was stopped at a border patrol checkpoint in Sierra Blanca -- a small town in West Texas where Willie Nelson was popped for weed back in 2010.
It's all pretty ironic -- considering Snoop RAILED against cops in 2010 for arresting the country singer, claiming, "They better leave Willie the f**k alone." (video below)
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