"Put on the dog" is an idiom that means to dress extravagantly or with great attention to detail. If you're looking for synonyms for this phrase, you could say "dress to impress," "decked out," or "spruced up." Other phrases that convey a similar sentiment include "dressed to the nines," "putting one's best foot forward," and "making a statement with one's appearance." No matter which synonym you choose, the underlying message is clear: looking sharp and well put-together is important and can make a strong impression on others. So the next time you want to impress someone with your appearance, remember to "put on the dog" and dress to impress.