The term used for people who slaughter horses varies according to the country they are in. In the USA it really has no term, but in the UK and many other areas it's called a Knacker or Abattoir. Also most countries other than the USA slaughter horses for consumption and as pet food. However it should be noted that most horses are not suitable for human consumption due to the drugs that are used to keep them healthy.
A Knacker
Alive and well
Marines' Hymn
68%
Edward Payson's Sunday Night Slaughters - 2013 was released on: USA: 10 October 2013
unknown. apparently.
because he wants to get the Cyclops out of his way
Teeter-totter,
1957
a butcher is an occupation that sells and slaughters animals to eat.
Rob Hilliard
Edward Payson's Sunday Night Slaughters - 2013 The Devil's Due 1-2 was released on: USA: 31 October 2013
Edward Payson's Sunday Night Slaughters - 2013 The Clown and the Christian 1-1 was released on: USA: 10 October 2013