Nà zhī xiǎogǒu zāngxīxī de, wǒmen gěi tā xǐ le gè zǎo.
The puppy was filthy, so we gave it a bath.
Tips
grammar
ABB adjectives such as 脏兮兮 carry their own intensity, so they never take 很: say 脏兮兮的, not 很脏兮兮. They usually end in 的, before a noun or at the end of the sentence: 脏兮兮的手 'grubby hands'.
usage
兮兮 adds a vivid, slightly mocking tone: compare 可怜兮兮 'pitiful-looking' and 神秘兮兮 'all mysterious'. Other ABB words for the senses: 香喷喷 'delicious-smelling', 臭烘烘 'stinking'.