Some owners of disobedient dogs may have trouble believing this, but dogs can learn to recognize a vocabulary of about 165 words. Unsurprisingly, dogs respond best to short words, as well as words with hard consonants like "t" or "r," which may explain why they can hear "treat" from three rooms away.
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If you want to try to expand your dog's vocabulary, be consistent—for example, always call a meal "dinner" instead of breakfast, lunch, or supper. And don't believe the myth: Old dogs can learn words just as well as young dogs.
