Things that aren't clean are dirty. The greasy pans in your sink, your muddy shoes, your smelly dog, your strange uncle's jokes — all of these things are dirty.
Yahoo: 21 Last-Minute DIY Costumes for Dogs Who Didn't Get the Halloween Memo
21 Last-Minute DIY Costumes for Dogs Who Didn't Get the Halloween Memo
Yahoo: 12 dog costumes under $20 that you can actually get in time for Halloween
12 dog costumes under $20 that you can actually get in time for Halloween
Newsweek: These Are the Most Popular Dog Halloween Costumes in Each US State
These Are the Most Popular Dog Halloween Costumes in Each US State
dirty, filthy, foul, nasty, squalid mean conspicuously unclean or impure. dirty emphasizes the presence of dirt more than an emotional reaction to it. filthy carries a strong suggestion of offensiveness and typically of gradually accumulated dirt that begrimes and besmears.