Share 'Aggressive behaviour towards other dogs'

I had a really awful day today with my dog Lily who is 18 months old.  I recently posted about her digging problem.  She has started barking at any noise that she hears and at other dogs in the park.  I normally walk her with a friend who is a dog walker with two small dogs and they always play very well together.  Today my friend had a different dog with her and Lily became totally out of contro…