Two short-haired cats mate and produce six short- haired and two long-haired kittens. what does this information suggest about how hair length is inherited?

In the progeny, six kittens were short haired and two were long haired. The ratio of short to long haired kittens is 3:1 which is a classic monohybrid cross ratio. Here, short hair is inherited dominantly and long hair is inherited recessively.  Both the parents are heterozygous for short hair trait (Ss). Cross between them:

Ss X Ss :

   S      s

S  SS   Ss

s   Ss    ss

Genotypically: 1    :    2    :    1

                      SS      Ss       ss

Phenotypically:   3         :      1          = 6 short and 2 long haired kittens

                       short hair   long hair

Hence short hair is dominant over long hair in these cats.