Author: Martin William
All pictures we got from our Animal's Look Facebook page fans except the last two.
References:
Brice C Ryan et al 2002, Intrauterine Position Effects
Lindsay S R 2000, Handbook of Applied Dog Behaviour and Training Vol 1
Hastings P & Rouse E 2004, Another Piece of the Puzzle: Puppy Development
Scott JP & Fuller JL 1965, Genetics and the Social Behavior of the Dog
