In general the business world remains conservative. Although being challenged by a desire of the new generations for self- expression the overall attitude of many employers is to prohibit things that might be considered a distraction in customer service or business meetings where the individual is representing the company.
When talking with an employee about their appearance it is important to remember the conversation should have some positives, especially if the person has a difficult personality - like a bull. Even though your company may not approve of piercings, tattoos, or odd shades of hair it is quite possible the person will be highly offended and cause trouble.
The stereotyping of bulls herein is not intended to offend anyone.