Pugs come in apricot, fawn, black, silver, brindle. Its likely that the pug bred into your dog was not fawn. That's it. Beagles don't have any color limitations. Most people see the parti or tri-color beagles, but they go way beyond that. They can be solid, they can be bluetick, they can be black and tan.

Bobsmom: Puggle have a long way to go. Besides looking alike, breeds must have a parent club to work toward being accepted as purebreds. Then they must breed first generation (G1) puggles to other first gens, G2 to G2, G3 to G3, and so on. This breeding must go on for about 20 generations or so without ever crossing back to the original breed or a previous generation. If the dog must be crossed back, the whole process must start over. This takes thousands of the hybrids to ensure a good gene pool and enough members of each generation to crossbreed to make sure you'll have enough of the next generation. Only after several generations do they even begin to try developing a proper standard. Unfortunately, back yard breeders rarely get past the first or second cross generation. They don't care about the breed becoming purebred. They don't care about conforming to a standard. Its just money.