pound

Reader's Digest 4月号の記事 'An Old Dog's New Trick' の冒頭を引用します。
There was an old dog in the middle of the road who seemed lost. You could tell he had loving owners because he looked well-fed and he had no street sense. The basset hound was blocking a busy street, and everyone was stopped. A man was able to coax the dog out of the road with a ham sandwitch he has packed for his lunch. The dog had no collar. I said I would take him to the police station. When I did, the police told me they did not handle animals. They said I would have to take him to the pound 20 miles away.
最後の文に出てきた "pound" の意味が分からないので辞書を見ます。
・Oxford English Dictionary: A place where stray animals, especially dogs, may be officially taken and kept until claimed by their owners or otherwise disposed of.: ‘Aided by a donkey sanctuary welfare officer, he followed a trail that led him to animal pounds and fields in remote areas in the black of night.’

・Cambridge English Dictionary: a place where pets that are lost or not wanted are kept: We got this mutt at the pound.
"pound" にこんな意味もあるとは知りませんでした。