| Clue | Source | Date |
|---|---|---|
| Cooped up like pigs | New York Times | 01 Oct 2020 |
| Placed a pig in a pen | ||
| Kept in a pigpen | Universal | 21 May 2017 |
| Pent up in a pigpen | Universal | 03 Apr 2017 |
| Put in a 26d | ||
| Pent up in a pigpen | ||
| Kept in a pigpen | ||
| Confined to a pig pen | Universal | 18 Sep 2016 |
| Confined to a pig pen | ||
| Kept in a pen | LA Times Daily | 18 Feb 2015 |
| Cooped up at Old MacDonald's | USA Today | 08 Jan 2015 |
| Kept in a pen | ||
| Cooped up at Old MacDonald's | ||
| Like a pig in a pen | ||
| Confined to a pen | ||
| Penned up | ||
| Put in a pen | ||
| Like a pig in a pen | ||
| Housed in a pen | ||
| Put in a pen | ||
| Put in a pen | ||
| Penned, as a pig | ||
| Kept in a pen | ||
| Put in a 97-Across | ||
| Penned | ||
| Kept in a pen | ||
| Cooped up at Old MacDonald's | ||
| Penned | ||
| Penned a pig | ||
| Put in a piggery | ||
| Penned, as pigs | ||
| In a piggery | ||
| Penned in. | ||
| Lodged in a filthy abode. | ||
| Penned up | ||
| Kept on the farm | ||
| Housed like a pig. | ||
| Penned like porkers. | ||
| Lodged, as porkers. |