We have a 3 year old boxer bitch. She is my mum's really and hence my mum has always walked her before now. We used to live right out in the sticks and so she was walked around the lanes and the fields and was ok, not perfect, but ok! She was taken to training classes as a pup, but they had kennel cough there so mum stopped taking her.
We have now moved to a new house right in town. Lily is now a nightmare to take on walks. She appears to be very aggressive towards other dogs. (We also have another older dog, who is very obedient, but we think she used to bark and 'go' at things, then retreat and Lily would go in all guns blazing!). I'm aware that part of the problem may well be because she is on a lead, but as she is quite a stocky lady we are afraid to let her off just in case she did actually attack, we're not sure she would though.
I started taking her to clicker training, we explained she was aggressive etc etc. She went along to the beginner classes and was really quite good, and got better and better as the weeks went on, learning sit, down, stay, wait etc. She is very greedy so the work for a reward system works quite well, and with the clicker she knows when she has got something correct. However, this is all very well when your confined in a room, or the house, but outside we just cannot keep her attention. I've tried taking treats, balls, etc but nothing is as exciting as other dogs. (the class was an 8 wk course, now waiting to start next stage!)
It is really now quite a problem, as I no longer want to take her anywhere as its such a fight!
She is going on an aggression course in october i think, where they will try to work out exactly how bad she is and whether or not she would actually attack, or if its just alot of noise about nothing.
When we meet bigger dogs on walks i always try to let her off and she is usually very good, but on a lead always lunges at everything making herself look very agressive. Its such a shame as she is a lovely lovely dog really. I realise this has all stemmed from not doing enough as a pup, but what can we do now to make her more manageable?!

I think you really need to get somebody to see the dog and how it's reacting - and this can't be done over the 'net as it's necessary to establish the *whys* before you can start to offer possible management solutions.  October isn't far away, so try and keep the stress levels down until then, and then you'll get some (hopefully) excellent advice and tips on how to deal with her.

Where is this 'agression course' BTW - are you going with her?  Or is it residential for her alone?

Thanks for your response, its in Devon. Its organised by the same people who we do the training with, but I think they hire a specialist lady to do this. It was supposed to be last month but got cancelled because they didn't have enough dogs.
All the people who live with her have to go, including our other dog. Even though she isn't any trouble herself, its possible she may be a contributuing factor!! Its a 1 day course, i think they basically assess her and us to try and find where the problem is. The trouble is, we know we probably make it worse, because you kind of go around 'looking' for a possible problem, so you can cross the road or whatever to avoid it, and then she starts looking too!

Is it Angela Stockdale?  If so, you really couldn't be seeing anyone better - hang on in there!!

I don't know what her name is I'm afraid, I'll let you know when I do find out though!! I'm sure that half of it is to just keep going with her general obedience training, but outside in the open she is selectively deaf!!