There’s hardly anyone who can argue with the popular saying ‘money doesn’t grow on trees,’ well, maybe except for this adorable dog. A clever canine named Negro managed to secure himself a seemingly endless supply of dog treats, by paying for them with leaves.

Negro lives at the Diversified Technical Education Institute of Monterrey Casanare in Colombia. The stray dog was adopted by the staff and freely roam around the school’s yard. Students would sometimes buy Negro cookies at the local store, but one day the smart dog decided that it was time for him to stop begging for treats because he had a better plan. After careful observation, this dog did something unthinkable. “One day, spontaneously, he appeared with a leaf in his mouth, wagging his tail and letting it be known that he wanted a cookie,” teacher Angela Garcia Bernal told The Dodo.

The black dog offered ‘take it or leaf it’ deal for the store’s attendant. Astonished by the dog’s intelligence, she couldn’t help but ‘sell’ Negro a cookie. “He comes for cookies every day,” Gladys Barreto, a longtime store attendant, told The Dodo. “He always pays with a leaf. It is his daily purchase.” Since his fake money literally grows on trees, the store’s staff decided to allow Negro to buy treats only a couple times a day.

Smartest dog Negro left everyone speechless. “When you first see it, you almost want to cry. He’s found a way to make himself understood. He’s very intelligent,” Bernal said.

(h/t: thedodo)

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Meet Negro, a clever dog who lives at the Diversified Technical Education Institute of Monterrey Casanare in Colombia

Image credits: A Peña J David

The dog was adopted by the school staff and freely roams around the school’s yard

Image credits: Angela Garcia Bernal

Negro managed to secure himself a seemingly endless supply of treats, by paying for them with leaves

Image credits: A Peña J David

After seeing students giving something in exchange for cookies, he came up to the school’s store with a leaf in his mouth

Image credits: A Peña J David

The canine offered ‘take it or leaf it’ deal for the store’s attendant

Astonished by the dog’s intelligence, she couldn’t help but ‘sell’ Negro a cookie

Image credits: A Peña J David

Since his fortune literally grows on trees, the store’s staff decided to allow Negro to buy treats only couple times a day

Image credits: A Peña J David

This clever dog left everyone completely speechless

Image credits: A Peña J David