Docking of dogs' tails.
Penny RH, Vet Rec, 2007 Jan 20 - link

Non-therapeutic docking of dogs' tails.
Penny RH, Vet Rec, 2006 Jan 14 - link

The relationship between tail biting in pigs, docking procedure and other management practices.
Hunter EJ, Jones TA, Guise HJ, Penny RH, Hoste S, Vet J, 2001 Jan - link

Tail-biting and tail-docking in pigs.
Smith WJ, Penny RH, Vet Rec, 1998 May 2 - link

Tail-biting and tail-docking in pigs.
Smith WJ, Penny RH, Vet Rec, 1998 Apr 11 - link

Tail-biting and tail-docking in pigs.
Guise HJ, Penny RH, Vet Rec, 1998 Jan 10 - link