When a dog is truly itchy, modern medicine has genuinely good answers — and your vet may mention names like Apoquel, Cytopoint, or immunotherapy (“allergy shots”). The trouble is they're usually explained in about thirty seconds, and you leave with a prescription but no real understanding. This guide fixes that: how each one works, how fast and how long it lasts, and — crucially — which ones manage the itch versus which one treats the underlying allergy.
One key idea up front: these treatments mostly target the itch and inflammation of environmental allergy. They are a separate question from diagnosing a food allergy — which is found with an elimination diet trial, not a drug. Many dogs need both: comfort now, and the detective work to find the cause.
Apoquel (oclacitinib): the fast daily tablet
Apoquel is an oral tablet that works quickly to switch off the itch. It targets the signalling pathway behind the itch-producing cytokine (IL-31) and calms inflammation. As Vetster's Dr. Jo Myers describes it, Apoquel works by:
Blocking itch signals to the brain, stopping inflammatory cells from moving into the skin, reducing redness and inflammation.
- Speed: very fast — itch relief often within 24 hours.
- How it's given: a tablet at home, typically twice daily for the first couple of weeks, then once daily.
- Good fit: dogs who are itchy and may also get some skin/ear flare-ups, because it has anti-inflammatory action.
- Trade-offs: it's a daily commitment, and like any medication has considerations your vet will discuss.
Cytopoint (lokivetmab): the periodic injection
Cytopoint is a different kind of medicine — a biologic, specifically a lab-made antibody that mops up the itch signal (IL-31) in the bloodstream before it can reach the brain. It's given as an injection at the vet.
- Speed: fast — many dogs are more comfortable within a day.
- How it's given: a subcutaneous injection by your vet, roughly every 4–8 weeks.
- Good fit: itchy dogs, often those who don't get many secondary infections; also handy when giving a daily tablet is hard.
- Trade-offs: requires a vet visit for each dose, and duration between injections varies by dog.
The practical difference between the two is rhythm — a pill every day versus an injection every month or two:
A rough comparison of dosing rhythm, not effectiveness — both control the itch well. Immunotherapy works on a completely different timescale (see below): it's not a per-dose fix but a long-term retraining of the immune system. Source: Vetster — Cytopoint vs Apoquel (Dr. Jo Myers)
The crucial catch: they control, they don't cure
Both Apoquel and Cytopoint are excellent at making an allergic dog comfortable — but neither one fixes the allergy itself. As Dr. Myers puts it plainly:
Both Apoquel and Cytopoint can successfully provide symptom control, but they do not cure allergies.
Stop the medication and the itch comes back, because the underlying allergy is still there. For many dogs, ongoing symptom control is a perfectly good plan. But it's worth knowing there's one option that aims higher.
Immunotherapy (ASIT): retraining the immune system
Allergen-specific immunotherapy — the 'allergy vaccine', given as injections or under-the-tongue drops — is different in kind. Instead of blocking the itch, it gradually exposes the immune system to tiny, increasing amounts of the specific environmental allergens your dog reacts to, retraining it to tolerate them. Per the 2023 AAHA allergic skin disease guidelines, it's the approach that aims at the disease itself rather than just the signs.
- What it targets: environmental allergens (pollens, mites, moulds) — identified first by allergy testing.
- Speed: slow — it can take many months to show its benefit, so it's a long game, usually alongside symptom control at first.
- The pay-off: it's the only option that can actually change the underlying allergy over time, potentially reducing the need for other medication.
- Best for: dogs with confirmed environmental allergy (atopic dermatitis), especially younger dogs facing a lifetime of it.
Where the food trial fits
Here's the piece that ties it together. None of these three treatments diagnose or fix a food allergy. If food is driving your dog's itch, the answer isn't a stronger drug — it's identifying and removing the trigger ingredient through an elimination trial. As dermatologist Dr. Heng Tham notes, a food allergy is only confirmed when signs resolve on the diet and return on re-challenge.
In practice these work together: a vet may use Apoquel or Cytopoint to keep your dog comfortable while you run a diet trial or wait for immunotherapy to kick in — and if food turns out to be the culprit, the right diet may reduce how much medication your dog needs at all. (Unsure whether it's food or environment? See food vs. environmental allergies.)
How to choose — with your vet
There's no single 'best' — the right choice depends on your dog. Useful things to weigh together with your vet:
- How severe and how constant the itch is.
- Whether your dog gets recurrent skin or ear infections (which may favour an anti-inflammatory approach).
- Whether a daily tablet or a periodic injection fits your routine.
- Your dog's age and whether you want to target the underlying allergy long-term.
- Whether a food component has been ruled in or out with a trial.
Medication keeps your dog comfortable; a diet trial finds a food cause. Run one properly with ThePawcess.
Rule food in or out — freeFrequently asked questions
What's the difference between Apoquel and Cytopoint?
Both control allergic itch quickly, but Apoquel is a tablet given daily that blocks the itch-signalling pathway, while Cytopoint is an injection given every 4–8 weeks that uses a lab-made antibody to neutralise the itch signal (IL-31). Neither cures the allergy — symptoms return if you stop. Which suits your dog is a decision for your vet.
Do Apoquel or Cytopoint cure dog allergies?
No. They provide excellent symptom control but do not cure the underlying allergy, so signs return when the medication wears off or is stopped. The only option that aims to change the underlying environmental allergy is immunotherapy, and a food component is addressed with an elimination diet, not these drugs.
What is immunotherapy for dogs and how is it different?
Immunotherapy (allergy shots or under-the-tongue drops) gradually exposes the immune system to the specific environmental allergens a dog reacts to, retraining it to tolerate them. Unlike Apoquel and Cytopoint, it targets the underlying allergy rather than just the itch — but it works slowly, over many months, and requires allergy testing first.
Will allergy medication fix my dog's food allergy?
No. Apoquel, Cytopoint and immunotherapy don't diagnose or treat food allergy. If food is the trigger, the fix is identifying and removing the ingredient through an elimination diet trial. Medication may keep your dog comfortable during the trial, but the diet is what addresses a food cause.
Experts & sources cited
Every quote in this article is real and links to its original source. ThePawcess is not a veterinary practice — this is educational, not a diagnosis.
