Does anybody recognise this old cartoon about farm animals? ?

I’m trying to find out what a movie was called that I watched when I was younger. It was traumatising! 

It wasn’t Animal Farm but it was about animals being mistreated on a farm. I think I remember one part where the farmer killed a pig to feed his dog but the dog didn’t want to eat it because they were friends. I remember a scene too where it showed the pigs’ bodies hanging up on hooks. It was in an old, hand-drawn style, maybe like Watership Down. I can’t find it anywhere and I can’t remember much of it but even my sister remembers watching it so it definitely exists. Does anybody maybe know what I’m talking about? 

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