“From what I’ve seen, logos typically receive the short end of the stick when it comes to responsive web design practices. Take a look through responsive galleries, and you’ll see that, in most examples, the logo is just shrunk to fit within available space.
For rectangular logos with simple and minimal details, this approach can work just fine. But if the composition or proportion of a logo is anything else, simply reducing its size for small screens may make small details unrecognizable, and small type unreadable. Fortunately, it doesn’t have to be this way.”
-Jeremy Frank (read his full article here)