The proverb 'If you lie down with dogs, you’ll rise with fleas' serves as a cautionary tale about the company one keeps. This saying, which dates back to the 16th century, emphasizes that associating with negative individuals can lead to adopting their bad habits. The phrase was first documented in 1573 in James J. Sanforde's book, *Garden of Pleasure*, which compiled proverbs from various languages, suggesting its roots in earlier European sayings. Over time, the proverb has evolved into various modern iterations, such as 'You get up with fleas' and 'You get fleas.' It is frequently cited in discussions about the consequences of risky behavior and the importance of choosing friends wisely, as one's social circle can significantly influence their life outcomes.