Mixed breed litters can have puppies who's looks range from 100% mom or 100% dad or any mix inbetween. That's why there is no predicting if designer breeds like the labradoodle will shed or not. You really could make a chart of the likelihood of the looks of a mix based on the genetics of the parents and which traits are dominant or recessive.

I think most dalmatian mixes have a lot of black. The spots turn into patches a lot rather than the nicely pronounced purebred spots.

As for beagle/spaniel mixes, they are very popular and still don't come out consistant in size, shape, color, or coat.