In one type of dog, black spots (B) are dominant over brown spots (b) and long tails (L) are dominant over short tails (I). Use the dihybrid cross for parents with genotypes BBLI and BbLI and determine the likelihood of offspring with the genotype BBLI.

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You would draw a four by four punnett square. On top, your genotypes are the father's.  Across: BL bL BL bL Down: BL Bl BL Bl 

Genotypes                                                   Phenotypes

BBLl:25%                                                    Black Spot Long Tail: 100%

BBLL: 25%                                                 Black Spot Short Tail: 0%

BbLl: 25%                                                   Brown Spot Long Tail: 0%

BbLL: 25%                                                 Brown Spot Short Tail: 0%

BBll: 0% 

bbLL: 0%

bbLl: 0%

bbll: 0%

Possibility of Genotypes: 25% BBLL, 25% BbLL, 25% BBLl, 25% BbLl  

Possibility of Phenotypes: 100% black spotted long tailed dog.

Hope this helps!