One allele of a gene for a trait can be dominant or recessive according to the simple genetic phenomenon.
But there are some exceptions Like both allele can express them dominantly producing an offspring having both forms of that trait.
While in incomplete dominance, dominant allele is unable to expresses itself completely and a phenotype between dominant and recessive trait is produced.
Hence in the problem, offspring have both colors of fur from two parents, so it is codominance.
