My two cents: I am a veterinary assistant and used to work at a hospital that did boarding. We charged extra for any "nursing". Nursing meant everything that involved technical skills. IOW, anything beyond administering medications. Even just administering insulin incorrectly could have horrible results. Not using a correctly-calibrated syringe could cause dangerous swings in their glucose levels. Inserting the needle too close to the spinal cord could paralyze an animal.