Short answer: they are not two versions of the same thing, so "which one is better" is the wrong question. Allergy shots are a vet-prescribed medical route aimed at your dog's actual allergy, and a daily mushroom topper is food that supports general immune and skin health. One is treatment. The other is support underneath the treatment, and it does not replace anything your vet has prescribed.
That sounds obvious written down. It is a lot less obvious at 11pm when someone in a Frenchie group posts "the allergy shot stopped working, should I try mushrooms instead."
What do Frenchie owners actually mean by "allergy shots"?
Usually one of two completely different things, and that mix-up is where most of the confusion starts. Sometimes people mean allergen-specific immunotherapy, a custom serum built from your dog's allergy test results. Sometimes they mean Cytopoint, the injection your vet gives in the office that quiets the itch for a month or two.
Those two do opposite kinds of work, Frenchie People. One is trying to change your dog's immune response over the long haul. The other turns down the itch signal right now. So when someone says "the shot isn't working anymore," they are almost always describing the second one wearing off, which is exactly what it is built to do.
(Apoquel comes up in the same breath constantly. It is an oral tablet, oclacitinib, not an injection, so it is not the "shot" either.)
What does allergen-specific immunotherapy actually do?
It is the only route on this list aimed at the allergy itself rather than the symptom. Your vet or a veterinary dermatologist tests to find what your dog reacts to, then gives gradually increasing amounts of those specific allergens, by injection or by drops under the tongue, to push the immune system toward tolerance.
Here is the part nobody tells you up front. In a 2021 review in Today's Veterinary Practice by Michaela Austel, DVM, DACVD, a board-certified veterinary dermatologist, the reported efficacy of conventional nonadjuvanted immunotherapy in dogs is given as 19% to 70%. That is an enormous range. And on timing, the same review tells vets to clearly communicate that it can take "several months to 1 to 2 years, depending on the individual patient."
Months to years. That is the number that makes owners quit at week nine and call it a failure. It is also why the same review calls immunotherapy "the only potentially disease-modifying and curative approach" for this type of allergy. Slow, and aimed at the root.
What does Cytopoint do, and why is it not the same thing?
Cytopoint blocks the itch signal. It does not change the underlying allergy. It is a caninized monoclonal antibody (lokivetmab) that, in Zoetis's own words, "specifically targets and neutralizes canine IL-31," the signal that tells your dog's brain to scratch. One injection, and Zoetis states repeat administration every 4 to 8 weeks as needed in individual patients.
So it working for six weeks and then fading is not a failure. That is the product doing precisely what it says on the box.
Worth knowing if your gremlin is on it and their paws are still angry: Cytopoint is aimed at itch. It does not clear a secondary skin or yeast infection, and it does not remove whatever started this. Red paws between injections are a conversation with your vet, not a reason to add a scoop of something to dinner.
So where does a mushroom supplement actually fit?
Underneath everything else, as daily support, never as the treatment. If your Frenchie has diagnosed atopic dermatitis and a prescribed plan, a topper is not the plan and we are not going to pretend it is.
Where a daily topper earns its place is around the edges. The dog whose vet plan is working and you want to support their skin and gut while it does. The dog with mild seasonal grumpiness who has never needed a prescription. The dog you are still investigating, where you are working out whether this is a food allergy or an environmental one, because that answer changes everything else you do.
Ours is Frenchies vs Mushrooms, a powder you scoop onto food once a day. Seven mushrooms including turkey tail, plus omega-3 and organic turmeric, built for this breed to support skin, digestion, immunity and long-term vitality. We are still going to tell you it is a topper and not a treatment, because that is true and you deserve the real version.
Can you do both at the same time?
Usually, yes, and you tell your vet either way. Vets combine things constantly. What they cannot do is account for something they do not know your dog is eating. Bring the jar to the appointment, or a photo of the ingredient panel, and let them make the call with full information.
Two rules will save you a lot of guessing. Change one thing at a time. If you start immunotherapy, switch food and add a topper in the same week, you will never know which one did anything. Give it a real window. Six to eight weeks before you judge a supplement, and much longer before you judge immunotherapy. Write the start date down. You will not remember it otherwise. Nobody does.
New to the mushroom side of this? Read whether mushroom supplements are safe for dogs before you buy anyone's jar, ours included.
Want the checklist version of this?
Drop your email and we'll send the one-page Frenchie Itch-Relief Checklist. What to rule out first, what to track, and the questions worth asking your vet before you commit to a long course of anything.
Frequently asked questions
Are allergy shots worth it for a French Bulldog?
They can be, as a long bet rather than a quick fix. The reported efficacy range is wide (19% to 70%) and it can take months to years to know. If you want the option aimed at the allergy itself, this is it. If you need your dog comfortable this month, it is not.
How long before I know if immunotherapy is working?
Longer than feels reasonable. Ask your vet at the start what a fair check-in point looks like for your Frenchie, then put that date in your calendar so you are not re-deciding every three weeks.
Can a mushroom supplement replace Cytopoint or Apoquel?
No. Those are prescription medicines for diagnosed allergic and atopic dermatitis, and a food topper is not a substitute for either. Never skip a prescribed treatment to try a supplement instead. Add support around a plan, do not swap it out.
My Frenchie is on Cytopoint and still licking their paws. What now?
Back to the vet, and be specific. Note which week of the cycle the licking starts, whether the paws smell, and whether the skin is red or just wet. That detail separates "the interval needs adjusting" from "there is a secondary infection here," and only your vet can sort out which.
What we'd use
For a Frenchie with a real diagnosis: whatever your vet prescribed, taken seriously, given the full window it needs. For daily support alongside it, or for the dog who is just a bit itchy in August, Frenchies vs Mushrooms, one scoop on dinner. Sixty scoops a jar, and no wrestling a gremlin who has already figured out what you are up to.
Tell your Frenchies hi for us.