LAST DAY! Earn 5,000 pts on $39+ with FREE Same-Day Delivery, see terms* >
11,764,897 Adoptions
Find a Store
Treats Rewards
Gift Cards
Learning Center
PetSmart Charities
Autoship
Shop
Brands
Services
Pharmacy
Halloween
Deals
Dog
Vitamins & Supplements
Immune System & Allergy
All filters
Shop by store
Brand
Search brands
Zesty Paws
(11)
Pet Wellbeing
(7)
Chew + Heal
(4)
Native Pet
(4)
Solid Gold
(4)
Pet Honesty
(3)
NaturVet
(2)
Nutramax Laboratories
(2)
Only Natural Pet
(2)
Operation Good Boy
(2)
Clear
View results
Price
$0 - $50+
Clear
View results
Rating
& up
& up
& up
& up
Clear
View results
Autoship
Sort by
Best sellers
Best sellers
Relevance
Price: low to high
Price: high to low
New arrivals
Top rated
Immune System & Allergy
(62 results)
Zesty Paws Dog Allergy & Immune Bites, Probiotics for Itchy Skin & Ears, Lamb Flavor, 90ct
Zesty Paws Itch Relief Bites, Dog Soft Chew Immune Supplement for Skin Health, Chicken Flavor, 90ct
PetArmor® Dog Antihistamine Diphenhydramine HCI Tablets, Itch Relief & Probiotic, 100 Count
Purina Pro Plan Veterinary Diets FortiFlora Chewable Tablets - Digestive Supplement - 90 Count
Wuffes Dog Allergy & Itch Chews, Seasonal Allergy Support, Pork Liver Flavor, 50 Count
4 sizes
Native Pet Dog Probiotic Digestive Health Powder Supplement, Made with Grassfed Beef, 1.7- 32.8oz
Pet Honesty Dog Allergy Support Supplement, Occasional & Seasonal Allergies, Peanut Butter, 90ct
Pet Honesty Dog Digestive Probiotics, Supports Digestive Tract, Pumpkin Flavor, 90ct
2 sizes
Native Pet Dog Allergy Air-Dried Chews, Itch Relief & Immune Support, Chicken, 60 & 120 CT
Zesty Paws Dog Supplement Chew No Poo Bites, Gut Health, Poop Eating Deterrent, Chicken Flavor, 90ct
1 size 2 flavors
Zesty Paws Dog Allergy & Immune Bites, Immune Support & Gut Health, Multiple Flavors, 90 Count
Zesty Paws Dog Vet Strength Allergy & Immune, Fish Oil & Immune Blend, Smoked Cheese Flavor, 90ct
Zesty Paws Dog Probiotic Bites, Support Gut Health and Immune Function, Chicken Flavor, 90ct
Only Natural Pet® Dog Aller Free Advanced Allergy Support Soft Chews, Natural Bacon Flavor, 60 Count
3 sizes
PetLab Co. Allergy & Immune Probiotic Dog Supplement, Pork Flavor, Small to Large Dogs
Nutramax Dog & Cat Cobalequin Chewable Tablets B12 Supplement with 5- MTHF, 45 Count
Nulo Dog Immune Dog Immune & Allergy Supplement, Prebiotic and Probiotics with Turmeric, 90 Count
Fera Pets Dog & Cat Mushroom Supplement, USDA Organic, Cognitive & Immune Health, 120 Scoops
3 sizes
WOOF Dog Allergy & Immunity Pupsicle Pops Refill, Immune Support, PB & Beef Flavor, Multiple Sizes
Pet Parents® Allergry SoftSupps® Dog Immune & Allergy Relief Supplement, Salmon Flavor, 90 Count
2 sizes
Native Pet Dog Beef Bone Broth Powder, Nutritional Topper for Picky Eaters, Real Beef, 4.75, 9.5oz
NaturVet All-in-One Dog Soft Chews Multivitamin Supplement, Probiotics, Bacon & Chicken, 60 Count
Zesty Paws Senior Dog Supplement Advanced Probiotic Bites, Gut Health Blend, Chicken Flavor, 90ct
Zesty Paws Dog Hemp Elements Allergy & Immune Bites, Seasonal Allergies, Cheese Flavor, 90ct
YumWell Allergy and Immune Support Dog Soft Chews, Supports Seasonal Allergies, Beef Flavor, 90 ct
Vetality Twist & Lick Aller-immune + Skin & Coat Supplement 2.3 oz
Rooted Owl® Natural Immunity Vegan Supplement Capsules for Dog & Cat, Mushroom Blend, 60 Count
Pet Honesty Dog Allergy Support Fresh Sticks, Pumpkin Peanut Butter Flavored, 30 Count
NaturVet Dog Lickable Multi-Vitamin Immunity Food Supplement, Peanut Butter Flavor, 6.4 fl oz
Zesty Paws Dog Probiotic Bites for Puppies, Gut Health & Gut Flora, Pumpkin Flavor, 90 Count
Pet Protect Dog Allergy & Immune+ Soft Chew Supplements, Vet-Formulated, Bacon Flavor, 60 Count
Chew + Heal Dog Immune Support Mushroom Complex Soft Chews, Made in USA, 90 Count
Native Pet Dog Colostrum Immune System Support Powder Supplement, Boosts Immunity , 2.2 oz
Zesty Paws Dog Probiotic Powder Supplement, Gut Flora & Digestive Aid, Pumpkin Flavor, 30 Count
Zesty Paws Dog Allergy & Immune Bites Immune & Gut Support Supplement, Lamb Flavor, 250 Count
Rocco & Roxie Dog Allergy Health Supplement Soft Chew, Seasonal Allergy, Duck Flavor, 60 Count
Greenies Dog Allergy & Immune Support Sensitive Care Supplement, Peanut Butter Flavor, 40-80 Count
Chew + Heal Dog Allergy Itch Relief Vitamin, Immune System Supplements, Chicken Flavor, 90 Count
Healthy Pup Dog Multi Max Multifunctional Daily Support Soft Chews, Daily Vitamin, 120 Count
Chew + Heal Dog Milk Thistle Moringa Oil & Salmon Oil Liver Support Tincture, Skin & Coat, 2-fl oz
1
2
