Guide dogs are not the only type of service animal. Other kinds of animals can be trained to help people with disabilities too. Welcome service animals into your workplace or business.
If a service animal is excluded by law, provide another way for the person to access your goods and services. For example, in a restaurant, under the Safety Regulations for Food making or prep areas you are not allowed to have animals in that area.
So, to accommodate a person who requires a service animal you could say you are only allowed to be in the restaurant seated area not in the food prep or serving area.
The idea here is to try and accommodate to the best of your ability. You are not allowed to go against what other laws or regulations say for your workplace.
Never talk to a service animal or touch a service animal. They are trained to serve the individual and are not to be treated as a pet in any way. They are at work and have been trained as such.