It might be a case of the link being wrong? Or the page missing. I'd maybe try and add the pound.php and poundview.php files in again and see if that fixes it... and if not, have you made any modifications to the base file? That can sometimes make something broken, until you find the problem lol
For me the problem was the duration being set higher than I meant XD I might go and see if I can readopt pounded pets on my current in-progress site... will update when I have tested it out