I need help doing this Genetics Prob...HELP?

Two independently orting loci interact to exert a major influence on fur color in some varieties of dogs, like Labrador Retrievers. Alleles at the B locus determine the amount of the pigment melanin deposited in the strands of fur. The dominant allele, B, results in more pigment deposition to produce black fur, while expression of the recessive allele, b, results in less pigment deposition to produce brown (chocolate) fur. At the I locus the dominant allele, I, inhibits the depositing of melanin and results in white or light yellow fur, while expression of its recessive counterpart, i, allows melanin to be deposited normally. Determine the phenotypic ratio of the progeny produced by mating two phenotypically white dogs, each heterozygous at both loci.