Its more intensive than a hospital. Be prepared for swabs to be taken after your work.
Is it a "large animal practice " or an everyday high st one ( pets). If the latter-
Check out the "spring clean" idea, to see if they have had any Parvo (dog) cases, you can usually smell it if they have had a death. This is likely if they are associated with any Dog Rescue organisations or do work with the local pound. You then have to be very careful about cross contamination. There shouldnt be much dander about but masks are a good idea. Kennel meshing and the metal frames are a timeconsuming pain. Find out about any traps they have in the drains. Never found one yet with proper adequate drainage or a good sluice
Are you doing outside as well? Some will let you get away with a Sagewash but others will insist on hyperchlorite, along with the offlow problems.
Best to try and minimise risk by not going near any other clients with pets for a while and devoting old gear to the job.
Will they be shut down and empty?or are you working around sick creatures. ( chain mail gloves can be handy)
You are going to pick up a few fleas no matter what you do, they tend to be in the light switches etc.
Treat it like a crime scene and maybe price it like that, with a day work element for anything unforeseen that may crop up most of the work will be. I hope its a fairly modern building. Go through a point by point plan several times and then discuss.