1. The mouth. A dog will always pull has mouth closed tight just before he bites.

2. Body language. The dog's body language will get stiff and still just before he bites. Especially watch stillness. It's very subtle, but at same time very noticeable once you train your eye to look for it.

There are other things that you could look for depending on dog and type of aggression. However, you need to recognize that there are ALWAYS cues... it's just a matter of whether we are quick enough (or aware enough) to catch them.

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3. Don’t Walk Around Your Dog Does your dog lie on floor and expect you to walk around him? In wild, dominant dogs lie wherever they want, and dogs lower in social order go around so they don’t disturb Big Dog. If you walk around your dog, he will assume this to be an act of submission on your part; therefore he must be leader, not you. If your dog is lying in middle of hallway, or right in front of your easy chair, make him move. If he’s on couch and you want to lie down, make him move. Don’t step over him. Just gently nudge him and make him get out of your way. You’re Big Dog, remember?

4. You Determine When Your Dog Gets Attention Even asking for attention or affection can be seen as an act of dominance from your dog’s point of view. Dogs that demand attention are asserting dominance, so if your dog gets pushy, ignore him. When you’re ready to give him attention or affection or pet or play with him, ask him to sit first. Don’t run after him just so you can pet him. Make him come to you when you’re ready to give him attention, or play with him. And when you play with a toy, make sure that you end up with possession of toy, and then put toy away when you’re done. (Note: I’m not talking about his favorite toys that you leave in his crate. I’m talking about play toys that two of you use for games.)

5. Don’t Let Your Dog Sleep In Your Bed This is a tough one for a lot of people, but when you let your dog share your bed, at best you’re making him an equal to you. He should have his own bed, either a dog pad or his crate that he feels comfortable in – you can even put dog pad next to your bed if that makes both of you happier – but don’t let him take over sleeping arrangements. Before you know it, he’ll be trying to make you sleep on floor! Again, reinforcing or retraining your dog to recognize you as Head Honcho has absolutely nothing to do with harsh discipline. These are changes you can make that will change way your dog thinks about you. And making even small changes like these can have an enormous impact on way your dog views social hierarchy in your home – all without a harsh word being spoken! http://tinyurl.com/6u2cj