The 20 Least Intelligent Dog Breeds Based on Scientific Research

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9. Mastiff

Mastiff Breed: Characteristics, Care & Photos | BeChewy
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Mastiffs are gentle giants with a reputation for being a bit slow on the uptake. Their laid-back nature means they’re not always eager to learn commands. However, their calm demeanor and loyalty make them excellent family pets, even if they’re not the quickest learners.

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