4.5(5,300)Amazon rating$5.176,000+ bought last month
Our verdict
Hartz UltraGuard combines an oatmeal base with flea and tick killing action in one 18 oz bottle, and at $5.17 with a 4.5 star average across 5,300 reviews it's one of the most budget-friendly two-in-one shampoos in this lineup.
Owners who want to handle a flea or tick problem and soothe itchy skin in the same bath, especially for larger dogs given the large breed size labeling, without paying a premium price.
Skip if
You need a shampoo for puppies or very small dogs outside the labeled large breed size range, or you're looking for a gentle everyday wash rather than an active flea and tick treatment.
Form Liquid
Breed size Large
Weight 1.1 Pounds
Priced 70% below the category median ($16.99 across 131 tracked models)
Our scorecard
4.5/5overall
Owner rating4.5/5
4.5 average across 5,300 owner ratings
Popularity3.9/5
5,300 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog and cat food, health, gear and grooming we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
["This 18 oz bottle pairs oat, the active ingredient, with an oatmeal-based liquid formula meant to knock down fleas and ticks while calming irritated skin during the same bath. Hartz labels it for all life stages and sizes it toward large breed dogs, and it's listed as free of cashews for owners tracking allergens.", "Because it's built around active flea and tick ingredients rather than just a soothing wash, it fills a specific role: a dog that's already itchy from parasites can get relief and treatment in one step instead of needing a separate flea shampoo and a separate oatmeal shampoo.", "At $5.17, this is one of the least expensive shampoos in the category, and it's clearly resonating with a huge number of buyers, roughly 6,000 in the past month and 5,300 reviews at a 4.5 star average, making it a high-volume, low-cost pick for flea and tick season."]
Pros
Combines flea and tick killing action with an oatmeal base for itchy skin
Very affordable at $5.17 for 18 oz
Labeled for all life stages
High review volume (5,300) with a strong 4.5 star average
Free of cashews for allergen-conscious households
Cons
Sized toward large breed dogs, so it may not be the ideal fit for small or toy breeds
Active flea and tick ingredients mean it's not meant purely as a gentle daily wash
Specifications
Form
Liquid
Breed size
Large
Weight
1.1 Pounds
Performance notes
The oat-based formula is built to double as both a flea and tick treatment and a skin soother, so it's working on two fronts during a single bath rather than requiring a separate rinse-out flea treatment afterward. The all life stages labeling combined with a large breed size designation suggests Hartz is positioning it as a general-purpose option that leans toward bigger dogs.
What buyers say
With 5,300 reviews at a 4.5 star average and about 6,000 bought last month, this is clearly one of the higher-volume sellers in the flea and tick shampoo space, suggesting it delivers reliably enough to keep pace with that kind of repeat demand.
Does this shampoo actually kill fleas and ticks, or just soothe skin?
It's formulated with active ingredients meant to kill fleas and ticks along with an oatmeal base for itchy skin, so it's designed to handle both jobs in the same wash rather than working as a soothing-only shampoo.
Is it safe for puppies?
Hartz labels it for all life stages, though the breed size is listed as large, so owners of puppies or small breed dogs should double check the label directions and dosing before use.
Is this shampoo free of common allergens?
The listing notes it's cashew-free, which is helpful information for households managing specific allergen concerns, though owners should still check the full ingredient list for their dog's individual sensitivities.
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