Scientists have concluded that, on average, dogs know 89 words or phrases. Almost half of them are commands like “Sit!” or “Stop!” Some words also represent common verbs: “Wait” or “Treat”.
It found that the most educated dogs respond to more than 200 specific words, roughly the vocabulary of a two-year-old child. That is, animals have a certain level of understanding of language.
The size of a dog’s vocabulary was influenced by breed and service status (eg police dog). But her age and qualities of the owner – no.