pin·fold 
(pĭnfōld′)
(pĭnfōld′)n.
An enclosure where stray animals are confined; a pound.
tr.v. pin·fold·ed, pin·fold·ing, pin·folds
To confine in or as if in a pinfold.
[Middle English pynfold, alteration of Old English pundfald : pund-, enclosure + fald, fold.]