private static string IsGood(PersonModel person, PetModel pet)
{
//returns true if one prefrence matches and no overrides match
bool preference = person.PreferredClassification == pet.Classification || person.PreferredType == pet.Type || person.PreferredWeight == pet.GetWeightClass();
bool overrides = person.checkOverrides(pet);
return((preference && (!overrides)) ? "good": "bad");
}