Activate & earn 5K pts on $60 dog food or $25 cat food & litter thru 2/1* >
11,585,910
 lives saved.
Find a Store
Treats Rewards
Gift Cards
Learning Center
PetSmart Charities
Autoship
Menu
Shop
Brands
Services
Pharmacy
New Pet
Deals
Search
Search
Cancel
Checkout
Dog
Vitamins & Supplements
Immune System & Allergy
All filters
Shop by store
Brand
Search brands
Zesty Paws
(10)
Pet Wellbeing
(7)
Solid Gold
(4)
Pet Honesty
(3)
Chew + Heal
(2)
Native Pet
(2)
Only Natural Pet
(2)
Fera Pets
(1)
Greenies
(1)
Liquid-Vet
(1)
Clear
View results
Price
$0 - $50+
Clear
View results
Rating
& up
& up
& up
& up
Clear
View results
Sort by
Best sellers
Best sellers
Relevance
Price: low to high
Price: high to low
New arrivals
Top rated
Immune, System & Allergy
(48 results)
Zesty Paws Allergy & Immune System Supplement for Dogs - Lamb Flavored Soft Chews - 90 Count
2 sizes
Native Pet Allergy & Immune Chews Allergy & Itch Relief Supplement for Dogs
Pet Honesty Allergy Support - Soft Chews
Pet Honesty Digestive Probiotics - Soft Chews
Zesty Paws Chew No Poo Bites for Dogs - Chicken Flavor - 90 ct
1 size 2 flavors
Zesty Paws Allergy & Immune Bites for Dogs - 90 Ct
Only Natural Pet® Aller Free Advanced Allergy Support Soft Dog Chews
3 sizes
WOOF Allergy & Immunity Pupsicle Pops Refill for Dogs
Zesty Paws Probiotic Bites for Dogs - Chicken Flavor - 90 Ct
Zesty Paws Vet Strength Allergy & Immune Bites for Dogs - Cheese Flavor - 90 Ct
Zesty Paws Hemp Elements Allergy & Immune Bites for Dogs - Cheese Flavor - 90 Ct
PetArmor® Antihistamine Diphenhydramine HCI Tabs for Dogs
Zesty Paws Puppy Probiotic Bites for Dogs, Pumpkin, 90 Count
Fera Pets Immune Support Mushroom Blend for Dogs and Cats
Zesty Paws Allergy Immune Bites Lamb, 250 Count
Super Shroom Dog & Cat Immune Support Supplement
2 sizes 1 flavor
Pet Wellbeing Throat GOLD Liquid Respiratory Dog & Cat Supplement
2 sizes 1 flavor
Pet Wellbeing Kidney Support GOLD Liquid Kidney Dog & Cat Supplement
Pet Wellbeing Mushroom Immune GOLD Liquid Immune Dog & Cat Supplement
Zesty Paws Senior Advanced Probiotic Bites for Dogs - Chicken Flavor - 90 Ct
Purina Pro Plan Veterinary Diets FortiFlora Chewable Tablets - Digestive Supplement - 90 Count
Vetality Twist & Lick Aller-immune + Skin & Coat Supplement 2.3 oz
Rooted Owl®, Natural Immunity
Pet Honesty Allergy Support Fresh Sticks for Dogs, Pumpkin Peanut Butter Flavored, 30 Count
NaturVet Lickable Multi-Vitamin Immunity Food Supplement, Peanut Butter Flavor, 6.4 fl oz
Nulo Functional Immune Dog Supplement and Multi-Vitamin, with Turmeric, Prebiotic and Probiotics
Pet Protect Dog Allergy & Immune+, Vet-Formulated Seasonderm, Soft Chews, 60 Count
Chew + Heal Immune Support Mushroom Complex Soft Chews for Dogs
Native Pet Colostrum, 2.2 Oz
Zesty Paws Probiotic Powder, Pumpkin, 30 Count
2 sizes
Greenies Allergy & Immune Support Sensitive Care Dog Supplement, Peanut Butter Flavor, 80 Count Tub
Rocco & Roxie Allergy Supplement for Dogs, 60 Count Soft Chews
Pet Parents® Allergry SoftSupps® 90 Count
Chew + Heal Allergy Aid Supplement Soft Chews for Dogs
Operation Good Boy Immunity Supplement for Dogs
Pupford Gut Health & Immunity Puppy Supplement
Solid Gold Mellow Belly - 120 Count
Solid Gold Pet Pal-ergy Pro Allergy - 120 Count
Solid Gold Gaurdian - 120 Count
Wellness® Shield Immune Health & Seasonal Allergy Support Soft Chews
1
2