Sacrificing a toothless animal
If the sacrificial animal has no teeth at all or most of its teeth are missing, then the sacrifice of such an animal is not correct as per the Shariah. If most of the teeth are present and only some are missing, then sacrifice of such an animal is correct.
As mentioned in Durre Mukhtaar:
(Durre Mukhtaar, Vol. 5, Pg. No. 228)
It is given in Radd Ul Muhtaar:
(Radd Ul Muhtaar, Vol. 5, Pg. No. 228)