10 Best Probiotics For Dogs 2026 in the United States

Zesty Paws Vet Strength Probiotics for Dogs offers a thoughtful blend of ingredients aimed at improving your dog's digestion and immune health. It contains the DE111 Bacillus subtilis strain, which is clinically studied and known to support gut function and immunity—this gives confidence that the probiotic effect is backed by science. The addition of digestive enzymes like Amylase, Protease, and Bromelain helps break down food better, which can be great for dogs with sensitive stomachs. The formula also includes fiber and natural ingredients like ginger to support bowel health and digestive motility.

While it provides a focused strain rather than a complex mix, this can be beneficial if you prefer a targeted approach. The chews are designed to be tasty, making it easier to give supplements regularly without a struggle. They come in a convenient 90-count pack suitable for all dog breeds.

This product is a good choice for dog owners looking to support their pet's digestive health with a vet-formulated and palatable option. However, if you want a probiotic with multiple strains or detailed potency information, you might want to compare with other products.

The Purina Pro Plan Veterinary Supplements FortiFlora Dog Probiotic Supplement is a popular choice among veterinarians for managing digestive issues in dogs. With a probiotic strain of Enterococcus Faecium, it has a CFU count of 8 CFU/g, which supports intestinal health and balance. This product is suitable for all life stages and breeds, making it a versatile option for dog owners.

The supplement is in powder form, flavored with liver, which is often well-received by dogs, making it easy to administer. It also includes additional ingredients like vitamins C and E, zinc, and beta-carotene, which contribute to health and immune support.

However, the lack of multiple probiotic strains may limit its effectiveness for some dogs needing a broader spectrum of gut flora support. Additionally, the packaging is convenient but might result in more waste compared to bulk options. It's a solid choice for dog owners looking for a probiotic supplement, especially those dealing with digestive health issues.

Zesty Paws Dog Allergy Relief Chews are designed to support your dog's immune system, digestive health, and help with itchy skin and ear allergies. One of the strong points is the blend of six probiotic strains, including Lactobacillus acidophilus, which helps maintain a balanced gut flora. This diversity in probiotic strains is beneficial for digestive support. The product combines probiotics with other immune-supporting ingredients like Colostrum and Astragalus Root, plus a unique yeast fermentate called EpiCor, known to aid immune function.

The chews come in a soft, salmon-flavored form, which many dogs find tasty and easy to chew. This makes daily dosing simpler and enjoyable for pets. Another advantage is the suggested dosing based on dog weight, allowing for customized supplementation. Dogs with sensitive stomachs or specific allergies might want to review the ingredient list carefully.

These chews serve as a good choice if you're looking for a multi-purpose probiotic supplement that also targets allergy-related symptoms and immune support. Consulting with your vet about specific needs is recommended.