You need to wait until they are about 6 weeks and then you start them out slowly, with a little soft food, and then slowly make it a hard food. Hope this helps.
How Long Till Puppies Can Eat Dog Food?
Well its also good for you to give bull dogs peanut butter at 6 weeks. They love it!!! But you do have to at least soften it a little. Peanut butter helps them with their bones n not loose their fur