In this scenario, there are two dominant traits: short tails (D) and brown fur (H). To list all possible phenotypes, we need to consider the combinations of dominant and recessive alleles for both traits. There are four possible phenotypes:
1. Short tails and brown fur (DH): This cat has the dominant short tail allele (D) and the dominant brown fur allele (H).
2. Short tails and white fur (Dh): This cat has the dominant short tail allele (D) and the recessive white fur allele (h).
3. Long tails and brown fur (dH): This cat has the recessive long tail allele (d) and the dominant brown fur allele (H).
4. Long tails and white fur (dh): This cat has the recessive long tail allele (d) and the recessive white fur allele (h).
These four phenotypes cover all the possible combinations of the given traits in cats.