Semantics

У неё были маленькие, красивые уши, которые очень мило краснели на морозе. She had small, beautiful ears which turned appealingly pink from the cold.
Собака замерла и насторожила уши. The dog stood still and pricked its ears.
This entry is concerned with the use of the word ухо "ear" to refer to human and animal ears; special notes are provided when animal ears require specific expressions (mostly for describing the appearance and the movements of ears). Some of the expressions normally used to refer to human ears may be also used to refer to ears of animals, especially domestic animals and pets. Common sense will dictate which of the expressions can or cannot be used to refer to animals.

The word ухо, mostly in the singular, but sometimes, informally, in the plural form уши, is also used to mean "the sense of hearing, the ability to hear." In this meaning, the word ухо combines with very few expressions; these are also described in this entry, marked with a special note.

The word ухо is also used in the sense "an unusual perceptiveness for certain things," as in охотничье ухо "a hunter's ear," музыкальное ухо "a musician's ear." This meaning is not treated in this dictionary.