I have but it was in a very contrived way. Basically had to close the clinic after one patient came in, warmly greeted, gave anti stress even if the pet wasn't stressed, used surgery table and used the interaction 'is a good pet', then billed the owner. Rinse and repeat.
A very boring way to play but I just couldn't make it to 5 stars any other way despite all the pet owners having 5 stars over their heads.
When I play 'normally' I'm stuck at 4.5/4