Reference for Chullin 76:19

<big><strong>מתני׳</strong></big> השוחט לעובד כוכבי' שחיטתו כשרה

Moreover all this applies to a small animal, but wi regard to a large animal the rule is that whether it was the foreleg or the hind leg, whether it stretched it ou but did not bend it or bent it but did not stretch it out, it is valid.

Jastrow

Jastrow

Jastrow