The American College of Veterinary Behaviorists (ACVB) is the professional organization for veterinarians who have achieved board-certification in the specialty of Veterinary Behavior.
The Animal Behavior Society’s Directory of Certified Applied Animal Behaviorists (may not display properly in all versions of Explorer – try Firefox or Safari)
The ASPCA: pet behavior advice from ASPCA experts 24 hours a day, right from your computer.
“Beyond Cesar Millan” – a collection of articles “bringing together people who oppose cruel, violent or bullying methods of training or rehabilitating dogs; also those who question or challenge pack leadership, dominance theory, dog-as-wolf and other outdated ideas.”
David Mech’s article “Alpha Status, Dominance, and Division of Labor in Wolf Packs”
See also http://www.wolf.org/wolves/news/pdf/winter2008.pdf
Dr. Sophia Yin – The Art and Science of Animal Behavior
Dr. Ian Dunbar’s website
Articles by members of the UK’s Association of Pet Behaviour Counsellors (mostly, but not all, about dogs)
Dogs’ need for company, and how to prevent separation problems
Three reports on problems with dog breeding in the UK:
http://www.rspca.org/pedigreedogs
http://www.apgaw.org/reports-a-publications/pedigree-dog-report
http://breedinginquiry.files.wordpress.com/2010/01/final-dog-inquiry-120110.pdf
And, some commentary at: http://news.bbc.co.uk/1/hi/uk/8458223.stm