Company management, the facilities, policies
Policies made at the corporate level were often in disregard to each locations needs and preferences. Location managers had a much better feel for their employees and clients and should be better respected and listened to.
Also, removing the incentive of a good commission structure and taking tips away from employees to go into a "tip share" scheme for the holidays was ridiculous- we knew how much our clients were giving in comparison to what we received and it was no where near similar. If you are going to offer a low starting salary (35k when i started) you need to at least allow for competitive commission, benefits, and tips. Compensation was a big reason I and other strong employees left and many who stayed were less skilled and less able. The process for promotion was also fairly disappointing if you want to retain your strongest employees.
Facilities were often gross, understanding that they are animals and there will be some level of mess- it was still pretty gross compared to other facilities I worked at after I left. Staff members also had clear favorites and it was obvious in their speech and treatment of the dogs which is really inappropriate even if you tell them that it should like like the set of a commercial at all times with constant interaction, movement, etc.