... to shoot your own horse?
There are laws about burying them, laws about transporting them, laws about what happens to them at an abbatoir, but what about shooting a horse yourself rather than calling, or waiting for a Vet (eg, injury, illness, old age etc)
Always assuming you/the shooter held the appropriate firearm permits.
Would it be a case of shoot, shovel and shut up?
Would you do it, if you absolutely had to?