Hello!

Katie Woolard, chemical hygiene officer at Notre Dame. While I haven't run into this on the job at ND yet, we had a general chemistry TA with a seeing-eye dog when I was a TA in undergrad. The service dog always wore "doggles" (dog-goggles), a lab coat/covering, and little booties. When the TA was at the front of the room and giving pre-lab lecture, the guide dog has a chemical-resistant mat tucked by the front that he would sit/lie on. When the students were working and the TA was making the rounds, the dog would follow him and alert him to hazards in the walkway (eg. errant stools and other students). The aisles between benches were fairly wide, so this worked out well. All the students were informed beforehand and were reminded that it was a working animal and not a pet. No incidents or issues arose during the year.

As a side note, if the dog is an Emotional Support Animal (ESA) and not a service dog, I would not want that animal in the lab. They don't have to go through the same rigorous training that service dogs/guide dogs are required to undergo and could have behavioral issues that would create an unsafe environment. 

Katie Woolard