Parashas Acharei Mos · Passuk 17:04
Chabad.org — English translation + Rashi
Torah Temima points to Zevachim 112a.
English: Animals disqualified by sexual misconduct, dedication to idolatry, price of a dog, hire of a harlot, kilayim, terefah or caesarean birth — if slaughtered outside, no liability, because they are unfit to come before the Mishkan.
Disqualified animals exempt
Only animals that could validly stand before the Mishkan generate the prohibition of shechutei chutz.