Thank you all for your comments, I always find different ideas very helpful. I have to say that I dont find my spray harmful, its like shouting no, its just a way of breaking a behaviour, its was bought empty and doesn't contain any harmful substainses, it is silent not making one bit of noise and won't relate it to anything.

I have to say though I did read this in the RSPCA training manual and I sure they wouldn't advise something if it was harmful to a dog's personality in any way.

I will try other methods first, but do see this as a viable option and not harmful. If anyone has used it and has found it harmful or useful Im really up for your comments.

I do have a broad shoulder as a police officer I think I naturally have that but I do have a heart and wouldn't do anything to my pup that I really felt was un-called for.

Thanks again