Fangful

Cerberus, soon as our adit he espied, Quivering in every limb for anger, wide Opened his fangful mouths, and at us gnasht.

Source: wiktionary

The cat was curled in a soft armchair close by the fire. She yawned a fangful yawn, stretched her claws and sat up.

Source: wiktionary

As Kerin came abreast of the reptile, the lizard opened its eyes, looked around, and rose on stumpy legs. It swiveled about to face Kerin, scattering sand; it opened fangful jaws and hissed like a kettle.

Source: wiktionary

Such a woman's affectional demonstrations, if not wholly vampiral, would be a wide departure from the truth ; would not be really human, but snakish, fangful, Judas-like, because utterly and wholly empty of all genuine heartness, that ineffable delight man sighs for and expects.

Source: wiktionary