Here's something I didn't know about beagles… they change colors. Not like a chameleon, per se, but more like people (or their hair, at least).
Tricolour Beagles are almost always born black and white. The white areas are typically set by eight weeks, but the black areas may fade to brown as the puppy matures. (The brown may take between one and two years to fully develop.) Some Beagles gradually change colour during their lives, and may lose their black markings entirely.
And it's happening to Oliver. Our black & white (and a little brown) tri-color beagle is slowly browning. You can see the slow progression when you compare his nose & ears in this picture in August versus this shot in December.
It's sad, because he's a beautiful dog and… even worse, it means that he won't be a "puppy" much longer.
Of course, I don't have a lot of room to talk. At least he's turning a color, which is more than I can say for my own hair. 🙂