
my dog is the same,hes an 8mth GSD. he goes mad when he sees a cat on our street,i too have tried food/toy distractions, and sitting him down to try and calm him down,nothing works, we also have a cat, and hes a nightmare with him,dont know why hes like this because he used to sleep with the cat when he was tiny. i wish i could offer you some help,but im at a loss too, so youre not on your own.