Free ears in dogs are controlled by the dominant allele (f) and attached ears are controlled by the recessive allele (f). in addition, short hair in dogs is due to a dominant allele (s) and long hair is due to a recessive allele (s) which of the following is the genotype of a dog with attached ears and short hair

The answer would be:

ffSS or ffSs

Here's more about your question:

Let's sort out the alleles of your problem according to trait:

Ears                                Hair

F - Free ears               S - Short hair

f  - Attached ears       s  - Long hair

When it comes to phenotypes, the trait expressed is dependent on the genotype.

For recessive traits to be expressed, there should be two pairs of recessive alleles, so when you look at the genotype you would see two lower case letters of the same trait. In your case you would see:

Ears                              Hair

ff         attached ears     ss    long hair

For dominant traits on the other hand only need at least one dominant allele to be present in the genotype. So in your case you would see:

Ears                         Hair

Ff         Free ears      Ss      Short hair

FF        Free ears      SS      Short hair

So we can just use this as your basis to get to your

Attached ears        short hair

      ff                         SS or Ss