In some other breeds, it may simply be though a matter of the tail not adhering to the dog's original function. In certain dog breeds, the presence of gay tail or high tailset, therefore disrupts the flow of the outline from the head to the tip of the tail. In many dog breeds, the gay tail is not appreciated much perhaps for the simple fact that it raises above the dog's topline, the flat line of the dog's back. In other breeds it may be frowned upon and sometimes even considered a serious fault. In certain breeds, a gay tail may actually be desirable and it may even be mentioned in the standard. This may sound like a fault, but it really depends on which dog breed you're talking about.