i was wondering why my 7 year old dog has now decided to fight we all other dog's?

I'm confused - you've headed the topic "My bitch" and then talk about your 'dog'. Which is it, because there are different reasons why dogs and bitches fight.

When she's says dog she means generally, not as in male dog. Their could be various reasons- unfortunately i cant think of any, why not ask a dog trainer or vet, they would be able to tell you.

My bitch became less tolerent of other dogs after she had been spayed maybe because of the op or maybe coincidental. :rolleyes:

Has she had a run-in with another dog that has made her defensive?

Sorry I can't help more.