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Zesty Paws Allergy Immune Bites (the lamb chew) is a convenient, treat-style supplement that combines bovine colostrum, EpiCor Pets yeast fermentate, astragalus, apple cider vinegar and a probiotic blend. Each ingredient has limited evidence for allergic itch in dogs, and the doses per chew are modest. It suits dogs with mild seasonal itch, not dogs in a food-allergy trial.
We did not test these chews on dogs or in a lab. We read the label panel in the product images, summarized it in our own words and compared it with published research. Zesty Paws has changed this formula between versions and retailers show different panels, so the figures below reflect the label as we read it in October 2026; check the panel on your own tub.
What is in Zesty Paws Allergy Immune Bites?
The label for the lamb chew (90 count) lists five actives. Two versions of the panel appear in the product images and differ by a few milligrams, so where they disagree we give both figures.
| Active | Per chew (label) | Our note |
|---|---|---|
| Bovine colostrum | 250 mg | A dairy ingredient carrying antibodies and lactoferrin |
| EpiCor (yeast fermentate) | 80 or 85 mg | A dried Saccharomyces cerevisiae fermentate, marketed as EpiCor Pets |
| Apple cider vinegar | 70 or 75 mg | We found no dog allergy research on it |
| Astragalus root | 60 mg | A traditional herb; no dog allergy trials we could find |
| Probiotic blend (5 strains) | 250 million CFU | Four Lactobacillus species plus Lactococcus lactis; not strains tested in allergic dogs |
The rest of the chew is a legume base (garbanzo and pea flour), flaxseed, lamb, coconut glycerin, palm fruit oil, cellulose, a prebiotic fiber (fructooligosaccharides), natural flavors, and mixed tocopherols and rosemary extract as preservatives.
Two details matter for allergic dogs. First, lamb is on the ingredient list itself, and colostrum is a dairy protein. Second, the lamb label does not list fish or salmon oil, even though the product page's marketing copy mentions omega-3 EPA and DHA. The only omega-3 source on the label is flaxseed, which supplies the plant omega-3 ALA rather than EPA and DHA. Some older and retailer versions of this chew, and the puppy version, do list salmon oil, which is why reading your own tub matters.
Do the ingredients help allergic itch?
No controlled trial of this chew in allergic dogs has been published, so the case rests on its ingredients.
Colostrum: limited
The main dog data come from a 40-week trial in 24 adult dogs, where colostrum raised fecal IgA, kept the gut microbiome more stable and improved the antibody response to a distemper vaccine. A 2025 review of bovine colostrum and canine immune health (opens in a new tab), written by Nestle Purina researchers, collects that and a puppy diarrhea study, reports no side effects, and describes no allergy or atopic dermatitis trials in dogs. So the evidence is about immune markers and gut health, not itch. For dosing and side effects of colostrum on its own, see colostrum for dogs.
Probiotics: limited
A 2025 meta-analysis (opens in a new tab) pooled five canine atopic dermatitis trials. Itch and lesion scores were lower in every probiotic group, but the pooled effect was not statistically significant. Those trials used specific strains, and none tested this exact 5-strain blend. Probiotics make more sense when an allergic dog also has loose stools; our probiotics for dogs with allergies page goes strain by strain.
EpiCor: very limited
The published animal work on this yeast fermentate is in rodents: a 2012 study (opens in a new tab) found less paw swelling in rats and lower arthritis scores in mice. It was funded by the ingredient's maker, and two of the three authors worked there. We found no peer-reviewed allergy trial in dogs.
Astragalus and apple cider vinegar: anecdotal
We found no canine allergy research for either at any dose, let alone 60 to 75 mg per chew.
Omega-3: moderate, but not really in this chew
Omega-3 fatty acids are the ingredient family with the best support for allergic skin. The 2015 ICADA treatment guidelines (opens in a new tab) say essential fatty acids may give a small benefit, are unlikely to work on their own, and may take about two months to show it. That is useful context, because the lamb chew states no EPA or DHA amount at all. If omega-3 is what you are after, a dedicated fish oil with a stated EPA and DHA dose does that job far more reliably.
Who these chews suit, and who should skip them
A reasonable fit if:
- Your dog has mild, seasonal itch and your vet has ruled out fleas, mites and skin infection.
- Your dog refuses oils, powders and tablets but eats any soft treat.
- You want gut and immune support in one daily chew and accept that the evidence is limited.
- Your dog has no known reaction to lamb, legumes (garbanzo and pea flour) or dairy.
Skip it, or ask your vet first, if:
- Your dog is in, or about to start, an elimination diet trial. VCA (opens in a new tab) warns that flavored supplements and treats can spoil a trial that needs at least eight weeks. A lamb chew with dairy colostrum is exactly that kind of hidden protein. Our dog food allergies guide explains how the trial works.
- Your dog reacts to lamb or dairy. Both are on this label. Dogs allergic to chicken are less of a concern with the lamb chew, but "natural flavors" do not name their source in full, so ask the brand if your dog is very sensitive.
- Your dog reacts to fish. The lamb chew is the one to look at; the salmon version is salmon flavored, and the bison and puppy versions list salmon oil.
- Your dog takes daily medication. The label says absorption of drugs taken at the same time may be delayed and recommends a vet exam before use.
- Your dog is pregnant or used for breeding. The label says safe use in those animals has not been proven.
- The itch is severe, sudden, or the skin is broken, smelly or oozing. That needs an exam, not a chew.
Zesty Paws Dog Allergy Chews (Lamb, 90 ct)
by Zesty Paws
Dogs- Form
- Lamb-flavored soft chews, 90 count
- Key actives
- Per chew (product page): colostrum 250 mg, EpiCor yeast fermentate 80-85 mg, apple cider vinegar 70-75 mg, astragalus 60 mg, 5-strain probiotic blend 250 million CFU; no fish oil on the ingredient list
- Best for
- Dogs that need a treat-style chew and owners who want colostrum + probiotics + EpiCor in one product
- Watch for
- Multi-ingredient chew, so it is hard to tell which ingredient helps; lamb flavor and other animal proteins make it a poor fit for food-allergy trials
We include the lamb chew because it is the most familiar Zesty Paws allergy product and the one most owners ask about. It works best as a convenience add-on for a treat-motivated dog with mild itch. Before buying, check the label panel in the product photos (and on the tub you receive) for the current colostrum amount and whether salmon oil is included, since that has changed between versions.
Which Zesty Paws allergy chew? The versions compared
Zesty Paws sells several allergy and immune chews under similar names. The actives are close; what changes is the flavor protein, whether fish oil is added, and how much the label states.
| Version | Flavor and animal proteins | Fish oil | What to know |
|---|---|---|---|
| Allergy Immune Bites, lamb | Lamb; dairy colostrum | None on the current label (flaxseed only) | The chew reviewed here; every active has a stated amount |
| Allergy Immune Bites, salmon | Salmon flavor; dairy colostrum | Not listed as an active | The product page shows the same actives and amounts as the lamb chew; a fit for dogs that do better on fish than on lamb |
| Allergy Immune Bites, peanut butter | Peanut butter flavor; dairy colostrum | Not listed | Same actives as the lamb chew with a 6-strain probiotic blend per the product page; check the panel for inactives before buying |
| Ancient Elements Aller-Immune Bites, bison | Bison flavor; dairy colostrum; salmon oil; grain base | Yes, amount not stated | Only the EpiCor amount is stated; adds licorice root (compared in detail below) |
| Puppy Aller-Immune Bites | Lamb flavor; dairy colostrum; salmon oil | Yes | For puppies from 8 weeks to 1 year, per the brand; follow the puppy pack's directions |
For a dog with a known protein sensitivity, the flavor is the deciding line: pick the version whose animal proteins your dog already eats without trouble. None of them suits an elimination diet. If salmon suits your dog better than lamb, this is the salmon chew:
Zesty Paws Dog Allergy Chews (Salmon, 90 ct)
by Zesty Paws
Dogs- Form
- Salmon-flavored soft chews, 90 count
- Key actives
- Per chew (product page): colostrum 250 mg, EpiCor yeast fermentate 80-85 mg, apple cider vinegar 70-75 mg, astragalus 60 mg, 5-strain probiotic blend 250 million CFU; no fish oil on the ingredient list
- Best for
- Dogs that need a treat-style chew and owners who want colostrum + probiotics + EpiCor in one product
- Watch for
- Same actives as the lamb version per the product page; salmon flavor, so check fish allergies; not for food-allergy trials
Lamb vs Ancient Elements bison: what changes?
The Ancient Elements Aller-Immune Bites use the same idea on a grain-based chew. Going by its label and the brand's description, the differences from the lamb chew are:
| Allergy Immune Bites (lamb) | Ancient Elements (bison) | |
|---|---|---|
| Base | Garbanzo and pea flour, flaxseed | Quinoa, millet, amaranth and sorghum flours |
| Animal proteins on the label | Lamb, dairy colostrum | Dairy colostrum, salmon oil; bison is the stated flavor |
| EpiCor per chew | 80 or 85 mg | 80 mg (stated in the brand's description) |
| Probiotic | 5-strain blend, 250 million CFU | The brand's description names DE111; the ingredient list names the same 5-strain blend; no CFU shown |
| Other actives | Astragalus, apple cider vinegar | Licorice root extract, apple cider vinegar |
| Amounts per chew | Stated for each active | Not stated except EpiCor |
The bison chew has one real advantage: it includes salmon oil, so it supplies some EPA and DHA, although the label does not say how much. Its downsides are fewer stated amounts, an inconsistent probiotic description, and licorice root, an herb worth clearing with your vet if your dog has heart or kidney disease or takes medication. Neither version is suitable during an elimination diet.
Zesty Paws Ancient Elements Allergy Chews (Bison, 90 ct)
by Zesty Paws
Dogs- Form
- Bison-flavored soft chews with an ancient-grain base, 90 count
- Key actives
- Colostrum, EpiCor 80 mg per chew, probiotic blend, salmon oil, licorice root, apple cider vinegar on an ancient-grain base (product page)
- Best for
- Owners who want a grain-inclusive (quinoa, millet) allergy chew
- Watch for
- Contains bison flavor, grains and salmon oil along with several actives - not suitable during strict elimination diets
Pick the bison version if your dog does better on a grain-inclusive chew or you specifically want some fish oil in the treat. Stay with the lamb version if your dog reacts to fish, or if you prefer a label that states the amount of every active.
Zesty Paws chews vs a single-ingredient plan
With the chew you get several small doses at once and no way to tell which one, if any, helps. With a single ingredient, such as a fish oil dosed to your dog's weight with your vet, you get the ingredient with the most support and a clear answer at the end of the trial.
| Combo chew (lamb) | Fish oil + vet plan | |
|---|---|---|
| Strongest ingredient evidence | Limited (colostrum, probiotics) | Moderate, small benefit (omega-3) |
| Dose control | Fixed per chew | Scaled to weight by EPA + DHA |
| Hidden proteins | Lamb, dairy, legumes | Fish only (check flavorings) |
| Ease of giving | Very easy, treat-like | Oily, smell, some dogs refuse |
| Fair review point | 6 to 8 weeks | About 3 months |
For many dogs, the most sensible order is fish oil first, then a chew only if you have a specific reason such as gut upset or a dog that will not take oil. If you are trying supplements because you want to avoid or reduce prescription itch medication, read Apoquel alternatives first; no chew works as fast or as strongly as those drugs. Other formats are compared in the best allergy supplements for dogs hub, and immune support for allergic dogs explains why "boosting" is the wrong goal.
Zesty Paws Allergy Immune Bites dosage by weight
The lamb and bison labels give the same directions:
| Dog's weight | Chews per day (label) |
|---|---|
| Up to 25 lb | 1 |
| 26 to 75 lb | 2 |
| Over 75 lb | 3 |
The label says to begin with half the suggested amount, build up gradually, and split the daily amount between morning and evening if you like. At the full label amount, a 90-count tub lasts about 90 days for a dog under 25 lb, 45 days for a medium dog and 30 days for a large dog. The Puppy Aller-Immune Bites (lamb) are a separate product that the brand describes for puppies from 8 weeks to 1 year; we could not confirm their weight chart, so follow the puppy pack itself.
Prefer the peanut butter flavor? It carries the same actives:
Check price on Amazon: Zesty Paws Dog Allergy Chews (Peanut Butter, 90 ct) (opens in a new tab)
For the puppy version we could not match one verified product page, so here is a search instead:
Search on Amazon: Zesty Paws Puppy Aller-Immune Bites (opens in a new tab)
How long to judge it
- Weeks 1 to 2: half dose, watch stools. Soft stool or gas is the usual early issue.
- Weeks 3 to 6: full label dose. Score itch daily on a 0-10 scale and note licking and paw chewing.
- Weeks 6 to 8: keep going and review. If the itch scores have not moved, the chew is probably not helping your dog. Pollen seasons can fool you, so compare with the same weeks last year (see seasonal allergies).
FAQ
Is there a puppy version of Zesty Paws Allergy Immune Bites?
Yes. Zesty Paws sells a lamb-flavored Puppy Aller-Immune Bites chew that the brand describes for puppies from 8 weeks to 1 year old. Its ingredient list also includes salmon oil, so follow the puppy pack's own directions and check with your vet before starting a young puppy.
Do Zesty Paws allergy chews make dogs sleepy?
None of the listed actives is a sedative, and the label does not mention drowsiness. If your dog seems lethargic after starting any supplement, stop it and call your vet, since tiredness can also be a sign of illness.
What side effects can Zesty Paws Allergy Immune Bites cause in dogs?
The most likely problems are soft stool, gas or a reaction to an ingredient such as lamb or dairy-based colostrum. The label suggests starting at half the amount, and it notes that absorption of drugs taken at the same time may be delayed.
Can I give Zesty Paws allergy chews with Apoquel?
Many owners do, but ask your vet first. The label itself recommends a veterinary exam before use and warns that absorption of other drugs taken at the same time may be delayed, so your vet may suggest spacing them apart.
Are Zesty Paws Allergy Immune Bites safe for cats?
No, these chews are labeled for dogs. The brand sells separate cat allergy and immune products, which this review does not cover.