I have just witnessed next doors dog violently attacking their cat in their back garden (from my bedroom window). Alerted by the most unholy noise, it had the cat pinned to the floor and was tearing at its neck. I'm guessing it wasn't going full pelt as the cat would presumably be dead, but it was definitely not playing. It was incredibly distressing to watch (I initially thought it was my cat).
I shouted which did nothing, ran next door, they took ages to answer but did rush out the back.
No sign of dog or cat now. They are absolute idiots, and we have an ongoing noise complaint with the council about the dog barking all night (they shut it in the conservatory overnight).
What do I do? I'm still slightly shaking from witnessing what I thought was my cat being killed, and also do not like my neighbours, so it's impossible to be impartial about this. From looking at the RSPCA website this is not the kind of thing they deal with or have capacity for?