If your dog gets into a hassle with another dog, quickly grab your dog's back legs and pull him backwards like a wheelbarrow.  This renders him helpless.  NEVER get between the two dogs!!
To learn more about dog/owner relationships and dog behavior, watch "The Dog Whisperer" on the National Geographic Channel.  You'll be surprised how much you learn!!
Understanding Your Dog
The biggest mistake many dog owners make is treating their dog like a human.  Dogs do not respond the same way a human would.  There are 3 key points that are basic to having your dog respect you, obey you, and have a healthy state of mind.
1.  First and foremost, you must be the pack leader.  In the world of dogs there is one leader in each pack.  All the other dogs in the pack submit to the pack leader.  Your dog views its family as a pack.  If you do not show your dog that you are the pack leader, your dog will assume that role!
2.  Exercise gets rid of anxiety and agressive behavior.  A 30- minute walk every day is recommended.
3.  You will not correct unstable behavior (such as agression, fear or neurosis) by giving your dog affection.  It actually works the opposite way.  Giving affection during these times will encourage their undesireable behavior and block their mind from growing out if it.  It is like saying "good dog" to bad behavior.
Give your dog affection only when they submit to what you have asked them to do - not when they show unstable behavior.
Be consistent:  Repetition will make the message clear and allow them to learn.

Your goal is to keep your dog in a calm, submissive state of mind.
BE A GOOD PACK LEADER!
Has your cat or dog been on antibiotics recently?

If so, a very important step, that your vet may not have told you about, is to follow up with a good probiotic with enzymes.    Like people, when pets take antibiotics, not only do the antibiotics kill the bad bacteria but they also kill the good (the flora), which is needed for aiding in digestion and other healthy body functions.  Therefore, administering a probiotic once a day for about 2 weeks after they are done with the antibiotic, will restore their system to a healthy state.

I am an authorized distributor and sell pet probiotics at considerable discount   Please call me at (925) 330-8022 to order, or for more information.
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Reaction to Vaccinations
Some pets have reactions from being vaccinated.  There is a homeopathic product called Thuja 30c (available at Whole Foods) that you can give them to relieve the unwanted side effects (vomiting, not eating, lethargy, etc.)
And Remember . . . never vaccinate your pet if they are sick, stressed, or recovering from an injury or illness.