We got our hound mix (Cassie) from the humane society in May of 03. She was never aggresive unless she could sesnse fear of her in other ppl. But other dogs she usually loved meeting. We went to dog parks no problem, she would just usually mind her business and maybe play with other dogs once in a while.

We moved from Florida to Canada in May 05. In Oct 05 we adopted a 2 month old Chihuahua (Homer). They bonded pretty good, not too soon after they were playing and having fun.

After sometime we noticed our hound getting more and more aggressive on our walks with and w/o our puppy. It was to the point that it got embarrasing and when we saw other dogs on our walks, we would go another way. We tried various things to control it or deter it, but nothing has worked.

We then moved to AZ in May 06 and it has not changed, except now our puppy, who is 11m now, is doing the same thing on our walks. We go to the dog parks here and our hound is ok with these dogs, unless they get on her nerves then she will give the warning bark. Our puppy will usually get very defensive as soon as we get there, but after a few minutes, he seems ok, but he will always know where her sister is and not wander too far from her.

I don't know what to do. We are moving yet again, same state, different city, to house we are building and plan to be there for a while. I don't want this to be happening with the neighborhood dogs.
I just don't get how she can be so aggressive on walks, but at the park she is ok?
Can anyone provide some feedback or advice? I was thinking of getting a prong collar or a gentle leader.

Thanks,
Derek

You going the other way just makes the situation worse. Get yourself a prong collar and buy one of ed's dvd's on dominant dogs or use the search function on the top right corner of the page. This site has some great articles but actually watching it hands on in the dvd might help you even more.

To me, it sounds like after you added the new puppy, your hound mix somehow got the idea that she was the new leader of your pack. This is probably because of your inconsistencies in her training, and letting her run around the house with the new dog, dominating the new puppy and you as well.
I recommend that you go back to step 1 obedience training with both dogs. You should investigate Eds obedience videos if you don't have access to a good trainer or have no training experience yourself. Pulling on a leash to get to another dog or even barking at the end of the leash at another dog is inappropriate pack behavior, your dog does not respect you and this behavior needs to be corrected asap. The pp is right, avoiding the situation won't fix the problem. The way you have to build respect is through obedience training and implementing a program called nothing in life is free (the dog has to work and earn your affection and attention). The dog needs to go out? Sit first. The dog needs to eat? Sit first. The dog is going to get out of the car, sit first. The dog is barging past you through doorways, NO WAY. Have her sit while you walk through. I hope you get the idea.
Do you use a prong collar? If not, you should also look into buying one. For now, until this behavior is under control, you should also walk both dogs separately because the hound can misdirect his aggression onto the pup and kill it in the heat of the moment. It happens.
I would also suggest separating the dogs while you are not interacting with them so the hound cannot dominate the puppy while you are not home. Doing this will also help build a stronger bond between you and the puppy, and you will need this to fix the puppies behavior.
If you don't remedy this problem fast, you won't be able to walk your dogs at all because you will be running into all sorts of situations that you can't always avoid. I know you probably think these measures are extreme or inconvienent, but you know, this problem will be easy to solve if you focus on your timing of corrections (should be within a few seconds of the infraction) , being consistent (SO IMPORTANT), and using the right motivations (only you know the temperament of your dog and have to gauge her responses).
Good luck,
Michelle

ok, but why the 180 between the park and walking?

 Quote:

ok, but why the 180 between the park and walking?

It is territory that is up for grabs by the dog marking it (peeing) and by you not being dominant(walking the other way) It just reinforces in his head he is in charge in those areas.

Derek,
It is quite simple. At the park, the dog can run up to any other dog and mark where ever it wants, thus setting up its terratory. On leash, you are in control, and the dog is resisting your leadership, displaying dominance and aggression towards other dogs from a distance (hair up, slowing down walking speed or even freezing in place, slow tail wagging, ears back, as the other dogs approach closer, it escalates into pulling, barking, growling...). Frankly, by taking the dog to dog parks, you are worsening the problem. With a prong collar, you will want to correct the dog HARD at the first sign of such aggression (which is why you will want to walk the dogs separately until you get this under control). Here is what I suggest.
Find a dog in the neighborhood that is tied up or behind a fence that will bark and act wildly as you walk by. If you have an e collar, GREAT, if not, you can try it with a prong, but for some dogs the prong will agitate them more if you can't really effectively correct them. Then start from some distance away with your dog in a heel. The second your dog looks at the other dog, say NO (or HEY, which ever you use) then immediately give a strong pop with the prong collar, keep walking. At the same distance, test your dog again. If the dog again looks at the barking dog, you can do one of two things, either back up because you started too close, or pop the prong again, but harder. Test the dog again, and don't move in closer until you get an avoidance response from your dog (she should look away, or look at you or look straight ahead). Then move in closer, and repeat this exercise until you can walk your dog right next to the other dog and get no response from her whatsoever.

Leash aggression (aggression shown on a leash) is fairly common and the root cause is lack of control on the owner's part. By doing the above exercise, as well as other dominance building exercises, you can get control of your dog when other dogs are around. To be honest, although you claim that both dogs show limited aggression in the dog park setting, the aggression is there and could be an accident waiting to happen. When you say your hound will bark/growl if another dog gets on her nerves, that means when another dog trys to dominate her. If the wrong dog (another dominant aggressive dog) approaches a dog like your hound, you may be in for a proper dog fight, in fact I would bet on it. Your dogs don't need dog parks, just walk them regularly, train them regularly using obedience and the basic principles of pack dynamics and their behavior will improve, you will see. At the dog park, you completely lose control (unless you have e collar trained your dogs, which I assume you haven't). Dog parks are not safe places for your pets and lead to all kinds of behavioral issues like the ones you are seeing with your dogs. I see it ALL THE TIME in my clients dogs.
In my opinion, the addition of the puppy renewed your hounds interest in leading your pack, and going to the dog park enforces her role as pack leader because you can't enforce your commands AND there are so many other dogs there for her to dominate and build her pack drive. The aggressive behavior on leash is a very typical behavior of a dog that does not respect the human as the pack leader. This is easily, easily fixed if your dog is not handler aggressive and you can invest the time in rebuilding your pack, with your dogs at the bottom!!!
Good luck.
Michelle