The difference is: Are you focusing on similarities (to) or differences (with)? Here is a good explanation: https://www.dailywritingtips.com/compared-to-or-compared-with/ So, for Jacob's example, "compared with" is technically correct because it is about the difference between cats and dogs. However, I don't think many English speakers are that strict about it (or are even aware of the difference). I would say that in everyday Canadian or American English "compared...to" is used more often.

You're welcome!

Any way,thanks a lot.

Honestly, they're pretty interchangeable, but let me try to use them in some sentences. "Dogs are friendlier when compared with cats." or "Dogs are friendlier when compared to cats." Yea- no real difference there. Maybe someone can come up with a better difference :s