an attack dog

vivisection (The action of invasive treatment of a living organism for scientific investigation)

to dissect

coastal defense

to check / examine

clothes; wrap; put on

dam, embankment / prevent, anti-, -proof / defend

(sexuality, euphemistic) sadism, sadist / (colloquial) dominant personality

(education) highest academic grading in the S-A-B-C-F scale / (chiefly video games) S, the highest rank or grade (above A) commonly used in ranking systems in video games

small size