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To create a Punnett square for this scenario, let's assume that "O" represents the genotype for a dog with an unknown coat color.
The possible genotypes that would lead to a spotted phenotype are:
- O Bb
- O bb
Here is the Punnett square for these genotypes:
| B | b |
---------------------------
O | O B | O b |
---------------------------
O | O B | O b |
As you can see, in both cases, there is a 50% chance of producing a dog with a spotted phenotype.