Semantics

back
Ћн нёс на спинљ тяжёлый рюкзђк. He had a heavy backpack on his back.
spine
Кћшка зашипљла и вІгнула спќну. The cat hissed and arched its spine.
This entry is concerned with the use of the word спинђ denoting the back of humans and animals. No specific words or expressions exist for the back of animals. Common sense will dictate which of the expressions in this entry can or cannot be used to refer to animals.