伏 (Kanji for lay face down)

Onyomi

FUKU	He didn't want to lay face down because it would wrinkle his FUKU (服)

The person orders the dog to lay face down.

ふせ＊る	to lay face down - also means, "to keep this a secret, to hide the truth from outsiders." ★☆☆☆☆

降伏(こうふく)

surrender ★☆☆☆☆
降 (descend /rainfall / get out of vehicle ) + 伏 (lay face down) = 降伏 (surrender)

surrender - unlike the more casual 降参　（こうさん）, 降伏 is used when you, like, lose a war.