One of its alleles specifies white fur color. A second allele specifies brown fur

One of its alleles specifies white fur color. A second allele specifies brown fur color. Mice also are seen as white and brown patches. You want to determine
whether the relationship between the alleles is simple dominance (and if so which color is dominant)
incomplete or co-dominance. What sorts of genetic crosses would give you the answer? On what types
of observations would you base your answers? Name the type of inheritance.