What Only a Veterinarian Can Do (and Why It Matters to Your Team)

The reason these four acts read as a single, unmoving unit rather than four separate rules is that they all come from one definition.

The AVMA Model Veterinary Practice Act (2019) defines "practice of veterinary medicine" as: to diagnose, prognose, treat, correct, change, alleviate, or prevent animal disease, illness, pain, deformity, defect, or injury by any method — including any medical or surgical procedure, or the prescription, dispensing, administration, or application of any drug, medicine, biologic, or anesthetic.

That single sentence is where diagnose, prognose, prescribe, and surgery all trace back to.

It is a model act — guidance the AVMA drafts for state legislatures, not law in any state on its own.

But two enacted state statutes independently converge on the same core: California Business & Professions Code §4826 defines the practice around diagnosing, prescribing, administering treatment, and performing surgical or dental operations, plus holding oneself out as a veterinarian; Utah Code §58-28-102(11) defines it as diagnosing, prognosing, or treating any animal condition, plus administering, prescribing, or operating, plus the same title-holding-out clause.

Different states, same shape.

Diagnose — naming what's wrong with the animal, not just running the test that shows it. Prognose — predicting how the case will go. Prescribe — deciding the drug, dose, and condition it treats, and authorizing it; administering a drug someone else prescribed is a different act. Perform surgery — creating an incision, as opposed to closing one a veterinarian already made, which several states treat as a separate, more delegable act.

This page doesn't re-walk each of those four in full — the task-by-task breakdown, state variation on the delegable edges (suturing an existing incision, simple dental extractions), and what a specialty credential does and doesn't change is covered from the staff side in what a vet tech can't do.

What matters here is the mirror image: these four acts are what your license actually is, not just what your staff's license isn't.

A credentialed technician with a decade in emergency medicine and a brand-new veterinarian three weeks out of the NAVLE are not close to interchangeable on these four acts, and that is by design.

The authority to diagnose, prognose, prescribe, and operate is granted by state licensure — the NAVLE plus a state's own requirements — not earned incrementally through time on the floor.

A technician who has watched a thousand diagnoses made still cannot make one; a newly licensed veterinarian can, on day one.

That is also why the practice's DEA registration and controlled-substance authority sit with the veterinarian, and why a premises permit scheme in many states names a specific licensed veterinarian as the responsible party on-site regardless of who owns the practice.

The license is the actual unit of authority in a veterinary practice — everything else, including a job title, sits downstream of it.

It's easy to read "practice of veterinary medicine" as something that only happens with an animal on the table, but the model act's own commentary is explicit that the definition reaches further: it says the definition "stresses that the practice of veterinary medicine includes the use of telephonic and other electronic communications for the rendering of advice or recommendation for the diagnosis, treatment, correction, alteration, relief, or prevention of animal disease," adding that the intent is to regulate telemedicine, not to stop non-veterinarians from discussing animal care generally.

That is the same reasoning behind the rule that a veterinarian-client-patient relationship (VCPR) cannot be established solely by telephonic or electronic means in the model act, and it's why front-desk staff relaying a veterinarian's instructions is fine while a staff member forming an independent clinical opinion on a call is not.

The full VCPR picture — including the separate federal VCPR that governs extralabel drug use and doesn't always line up with your state's — is covered in the VCPR and telemedicine guide.

Framed from your side of the practice act, delegation isn't a list of what a technician or assistant is allowed to do — it's a duty you owe: to delegate only what can be delegated, to someone you've determined is competent for that specific task, at the supervision level it requires.

The four acts above are the one part of that duty with no state variation and no exception for a specialty credential — not even a Veterinary Technician Specialist changes who may diagnose, prognose, prescribe, or operate.

Everything below that floor is genuinely state-dependent — which supervision level attaches to which task, covered in the supervision-levels guide — and the exposure when delegation goes wrong sits with you, not the staff member who carried out the task.

The full framework for what can and can't be delegated, including the two separately disciplinable ways it goes wrong, is in what you can legally delegate in a veterinary practice.

A job posting that blurs these four acts into a technician's or assistant's listed duties creates a problem before the hire even starts — either for the practice, if it's genuinely asking for reserved work, or for recruiting, if capable candidates read the listing and assume the role requires authority it doesn't.

Describing scope accurately in a posting is one of the more overlooked ways a practice signals it actually understands its own delegation model.

It cuts the other way too on the veterinarian side of hiring: an associate's contract, production terms, and autonomy all sit on top of these same four acts being theirs alone the moment they're licensed, regardless of tenure at the practice.

Browse open veterinarian positions to see how that authority gets described — and how widely postings vary in getting it right.