General
The Pet Professional Guild  promoting force-free pet care
Behaviour
Yahoo Aggressive Behaviour Group (agbeh)  - the group discusses how to modify aggression toward other dogs and/or people.
The group includes members from all around the world with an interest in canine behavior and training. Among them are over 700 experienced dog trainers and other professionals, and over 2,000 pet owners.
Behavior Adjustment Training  About BAT with links to additional information complements the BAT book
The Top 10 Dog Behaviour Myths Written by Jean Donaldson 2008
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Body Language
Basic Training
Dogmantice Dog Training – The training Manifesto explains Emily Larlhams excellent training philosophy and there are also useful articles and brilliant training videos
Dog Star Daily – a good training resource with a library of digital training manuals, podcasts, blog, links etc – Dr Ian Dunbar
How to train – The Dogs Trust – a good explanation of how and why positive training not only works but works better than some of the more traditional methods
All Dog Trust Training Videos (25 topics)
The ‘Leave it’ command – a good explanation of the ‘leave’ command as I was taught to teach George and Arnie – imo a training priority
Articles