For the last week I've had an aggressive dog running into my garden whenever I enter that barks at me and tries to chase me off. I've covered most entry points, but due to the size of my garden he still manages to find a way in.

Any ideas of how to scare it off without hurting it?

Do you have a hose you can use?
On a jet setting rather than shower

Can see why you don't want anything that will hurt it.
but remember we don't want anything hurting you either.
Dog repellent might be an answer but it stinks I mean really honks its like 2 week old takeaway and dirty nappies but does work.

Mine would go nuts if you done that to him!!

Tell the owner you will report them for an out of control dog. I wouldn't get a jet washer as can turn them even more aggressive. My dog hates stuff like that and will bark at one from across the road.

Your local council will have to do something as its your property and its running around out of control not on a lead.

Scaring is probably not a good strategy.

Ask the owner to keep the dog under control.

Fix your boundary fence / wall in order to prevent entry.

Report to the dog warden the dog is clearly out of control and they will deal with it.

I always find that running at them with a broom and shouting "Gertcha" usually does the trick. They turn tail and run.

My dog used to find a way out even though o/h had checked all the fencing. It took spying out of the bedroom window to find that she had found out how to push through a loose fence panel that flapped back into place after her escape. Maybe you need to set up an observation point. If the dog is finding its way into your garden because your garden is not secure you can't really blame the owners although it might be a good idea to have a word and let them know you how you feel.

What, since when was the onus on property owner and not the dog owner to control their dog. Why is it out in public without a leash ?

Got there before me, it isn't up to people to keep dogs out it is up to us to keep them under control, a lead, a fence, whatever is appropriate to keep the dog out of other people's lives.

Attempt to give him a bath, you'll never see him again!

Joking aside, do you know who the owner is or is it a stray?

yeah or threaten him with the vet

There's an aggressive dog at the local livery and he terrorises the heathland round my way. I found puffing myself up and telling him in the deepest voice I could manage to "GO AWAY" worked very well. not sure it will always work but it's work having a go.

Agree that it's the owners responsibility though.

And yet, it would be a lot simpler to "fix the fence". Job done, problem solved.

Sometimes it just easier to "do something yourself".

It's like someone moaning about litter. Yes it's someone else's fault, but the only solution is to pick it up and put it in a bin. People should try it. It's good for the self esteem.

Or they think - "oh great, tug-o-war, my favorite!"

Best let the dog wardens deal with it. If you turn a hose on it, it could become more aggressive and end up attacking someone. Clearly the dog is potentially dangerous so leave it to the experts.

I assumed it was getting in from the next-door neighbours garden. Sorry.

If you can get hold of a football rattle, that would do the job a cheaper option would be to get an old empty drinks can, a tall beer can would be best, third fill it with gravel and chuck it on the floor between you both it makes a very sudden loud noise. You watch him cower, its never failed for me when I used to teach people to train aggressive dogs. Just pick it up quickly and don't let the dog sniff it.

A firm kick in the privates should do the job! (the owners not the dog! lol)

Well you are right but I think you have to also think of the wider society if you are having a problem with an aggressive dog coming onto your property you can keep yourself safe by fixing your fence but who is keeping the child innocently walking by safe or the od person walking her elderly dog ? reporting to the dog warden is the right way to go about it really and of course you can fix your fence too.

I don't understand how the size of your garden is affecting how the dog gets in?