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Top 6 Fiber Supplements for Dogs in the United States (2025): Veterinarian-Recommended, Clinically-Informed Choices for Better Digestion, Stool Quality and Weight Control

Soluble and insoluble fiber supplements for dogs are formulated to regulate bowel movements, support consistent stool formation, and nourish beneficial gut bacteria. These products are useful across common concerns such as constipation, loose stools, weight management and long-term colon health. American pet owners increasingly choose fiber supplements that combine clinically studied ingredients like psyllium, pumpkin, beet pulp and prebiotic inulin with clear dosing for different sizes and life stages. Market preferences in the United States emphasize veterinary endorsement, clean-label formulas, easy-to-dose formats (powders, chews, and liquid toppers), and sustainable packaging. Buyers also look for options that clearly state fiber type and amount per serving so they can match a product to their dog s specific issue, whether acute diarrhea, chronic constipation, or calorie control during weight loss.

Top Picks Summary

  1. Bernie's Perfect Poop Digestive Support
  2. Wholistic Pet Organics Digest-All Plus
  3. Fruitables Pumpkin SuperBlend Digestive Supplement
  4. Naturvet Digestive Enzymes Plus Probiotic Powder
  5. VetriScience Laboratories Digestive Support Pro Fiber
  6. VetriScience Laboratories Vetri Mega Probiotic Capsules
1
BEST SOLUBLE FIBER SUPPLEMENTS FOR DOGS

Bernie's Perfect Poop Digestive Support

Bernie's
🏠 Local Product

Bernie's Perfect Poop is recognized for delivering accessible, whole-food soluble fiber blends (pumpkin/psyllium-style ingredients) that help normalize stool consistency and are easy to add to meals. Against the other entries, it stands out as a budget-friendly, palatable daily-maintenance choice that emphasizes natural fiber sources rather than clinical actives, making it a practical preventive option for owners who prefer food-based fiber over veterinary gels or powders.

4.1
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  • Firms soft stool

  • Pumpkin-powered fiber

  • Firms soft stool

  • Pumpkin-powered fiber

Review Summary

80%

"Bernie's Perfect Poop is frequently praised for improving stool firmness and regularity over a few days to weeks, though some find it pricey and notice slower results in chronic cases. Most buyers appreciate the natural-fiber formula and palatability for repeated use."

  • Palatable powder

  • Powdered fiber supplement intended to help normalize stool consistency.

  • Palatable powder

  • Powdered fiber supplement intended to help normalize stool consistency.

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Bernie's Perfect Poop is recognized for delivering accessible, whole-food soluble fiber blends (pumpkin/psyllium-style ingredients) that help normalize stool consistency and are easy to add to meals. Against the other entries, it stands out as a budget-friendly, palatable daily-maintenance choice that emphasizes natural fiber sources rather than clinical actives, making it a practical preventive option for owners who prefer food-based fiber over veterinary gels or powders.

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$25-40 USD

2
BEST INSOLUBLE FIBER SUPPLEMENTS FOR DOGS

Wholistic Pet Organics Digest-All Plus

Wholistic Pet Organics
🏠 Local Product

A comprehensive, holistic maintenance formula that blends enzymes, probiotics, and fiber-friendly ingredients to support daily digestion alongside insoluble fiber additions; its broader ingredient set targets both breakdown and transit for long-term GI health. While it tends to be pricier than basic probiotic powders, Digest-All Plus offers the technical advantage of an all-in-one maintenance approach, reducing the need to buy multiple separate supplements.

4.1
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  • Complete digestion blend

  • Enzyme-probiotic duo

  • Complete digestion blend

  • Enzyme-probiotic duo

Review Summary

80%

"Frequent reports of reduced digestive upset and improved stool consistency when used long-term, with positive feedback on the natural formulation; a minority report no effect or mild sensitivity."

  • Herbal wink

  • Powder formula blending digestive enzymes, probiotics and prebiotic fiber to support regularity.

  • Herbal wink

  • Powder formula blending digestive enzymes, probiotics and prebiotic fiber to support regularity.

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Time-Saving Convenience

A comprehensive, holistic maintenance formula that blends enzymes, probiotics, and fiber-friendly ingredients to support daily digestion alongside insoluble fiber additions; its broader ingredient set targets both breakdown and transit for long-term GI health. While it tends to be pricier than basic probiotic powders, Digest-All Plus offers the technical advantage of an all-in-one maintenance approach, reducing the need to buy multiple separate supplements.

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$20-45 USD

3
BEST NATURAL FOOD-BASED FIBER SUPPLEMENTS FOR DOGS

Fruitables Pumpkin SuperBlend Digestive Supplement

Fruitables
🏠 Local Product

Fruitables Pumpkin SuperBlend takes a food-first approach, using pumpkin and other natural fibers to gently support stool quality and regularity, making it an affordable entry point for owners seeking a natural fiber supplement for dogs. Compared with enzyme- or whole-food-forward competitors on this list, Fruitables stands out for its palatable, pumpkin-focused formula and lower price, which makes it ideal for routine, short-term digestive support in dogs on a natural-food feeding plan.

4.6
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  • Pumpkin-powered relief

  • Sweet-potato boost

  • Pumpkin-powered relief

  • Sweet-potato boost

Review Summary

92%

"Users consistently report it firms and normalizes stools quickly, is easy to mix and palatable for most dogs; a few note a messy texture or limited effect in severe cases."

  • Sprinkle-and-go delight

  • Pumpkin-centered formula supplying soluble fiber to support regular bowel movements.

  • Sprinkle-and-go delight

  • Pumpkin-centered formula supplying soluble fiber to support regular bowel movements.

Increased Safety & Security

Time-Saving Convenience

Fruitables Pumpkin SuperBlend takes a food-first approach, using pumpkin and other natural fibers to gently support stool quality and regularity, making it an affordable entry point for owners seeking a natural fiber supplement for dogs. Compared with enzyme- or whole-food-forward competitors on this list, Fruitables stands out for its palatable, pumpkin-focused formula and lower price, which makes it ideal for routine, short-term digestive support in dogs on a natural-food feeding plan.

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$10-20 USD

4
BEST FIBER POWDER SUPPLEMENTS FOR DOGS

Naturvet Digestive Enzymes Plus Probiotic Powder

NaturVet
🏠 Local Product

Naturvet offers a widely distributed, budget-friendly powder that emphasizes digestive enzymes alongside probiotics to aid nutrient breakdown as well as stool quality. Its technical strength is the enzyme-rich profile useful for pets with food-digestion issues, and as a mass-market brand it often undercuts boutique formulas on price while still delivering measurable digestive support compared to purer fiber-only options.

4
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  • Gas reducer

  • Enzyme + probiotic

  • Gas reducer

  • Enzyme + probiotic

Review Summary

78%

"Naturvet Digestive Enzymes Plus Probiotic Powder gets favorable marks for reducing GI upset and improving stool quality for a majority of dogs, and it’s noted as an affordable option. Some reviewers see limited benefit for chronic issues and report mixed results."

  • Road-trip winner

  • Combines digestive enzymes with probiotics to aid digestion and support healthy stool formation

  • Road-trip winner

  • Combines digestive enzymes with probiotics to aid digestion and support healthy stool formation

Time-Saving Convenience

Naturvet offers a widely distributed, budget-friendly powder that emphasizes digestive enzymes alongside probiotics to aid nutrient breakdown as well as stool quality. Its technical strength is the enzyme-rich profile useful for pets with food-digestion issues, and as a mass-market brand it often undercuts boutique formulas on price while still delivering measurable digestive support compared to purer fiber-only options.

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$15-25 USD

5
BEST FIBER CHEWS FOR DOGS

VetriScience Laboratories Digestive Support Pro Fiber

VetriScience Laboratories Digestive Support Pro Fiber
🏠 Local Product

VetriScience positions as best-in-class for targeted fiber support thanks to a veterinarian-formulated fiber blend and precise dosing that emphasizes clinical efficacy over flash-in-the-pan palatability. It is technically advantaged for cases where controlled fiber intake and consistent results are required, and while typically pricier than consumer-focused brands like Zesty Paws, it offers a more specialist, vet-friendly profile for long-term digestive management.

4.6
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  • Veterinary strength

  • Fiber-rich formula

  • Veterinary strength

  • Fiber-rich formula

Review Summary

90%

"VetriScience’s Digestive Support Pro Fiber is frequently praised for reliably improving stool quality and easing digestive upset, with many owners valuing the vet-formulated ingredient profile; a small number note limited benefit for severe cases."

  • Vet-approved high-five

  • Veterinarian-developed formula combining probiotics with soluble and insoluble fiber for balanced digestion.

  • Vet-approved high-five

  • Veterinarian-developed formula combining probiotics with soluble and insoluble fiber for balanced digestion.

Increased Safety & Security

Time-Saving Convenience

VetriScience positions as best-in-class for targeted fiber support thanks to a veterinarian-formulated fiber blend and precise dosing that emphasizes clinical efficacy over flash-in-the-pan palatability. It is technically advantaged for cases where controlled fiber intake and consistent results are required, and while typically pricier than consumer-focused brands like Zesty Paws, it offers a more specialist, vet-friendly profile for long-term digestive management.

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$25-45 USD

6
BEST FIBER CAPSULES AND TABLETS FOR DOGS

VetriScience Laboratories Vetri Mega Probiotic Capsules

Vetri-Science Laboratories
🏠 Local Product

VetriScience Laboratories Vetri Mega Probiotic Capsules represent the market-leader, veterinary-grade option by offering high-potency probiotic formulations and rigorous quality control that appeal to practitioners and owners seeking clinical reliability. Though pricier than many chewables or basic tablets, their capsule format and vet-focused manufacturing deliver technical advantages in potency and consistency, making them a preferred choice when probiotic strength and product integrity are prioritized over simple fiber supplementation.

4.4
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  • Multi-strain capsule

  • High-potency CFUs

  • Multi-strain capsule

  • High-potency CFUs

Review Summary

84%

"VetriScience Vetri Mega Probiotic Capsules are regarded as a high-quality, vet-recommended option that supports long-term gut health for many dogs, but they are pricier and results can vary by individual."

  • Capsule-to-food magic

  • High-potency probiotic capsule from a veterinary supplement manufacturer

  • Capsule-to-food magic

  • High-potency probiotic capsule from a veterinary supplement manufacturer

Increased Safety & Security

Time-Saving Convenience

VetriScience Laboratories Vetri Mega Probiotic Capsules represent the market-leader, veterinary-grade option by offering high-potency probiotic formulations and rigorous quality control that appeal to practitioners and owners seeking clinical reliability. Though pricier than many chewables or basic tablets, their capsule format and vet-focused manufacturing deliver technical advantages in potency and consistency, making them a preferred choice when probiotic strength and product integrity are prioritized over simple fiber supplementation.

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$40-80 USD

What the Research Says About Fiber for Dogs

Scientific and veterinary literature supports using targeted fiber sources to improve stool consistency, normalize transit time and support a healthy gut microbiome. Different fibers work in different ways: soluble fibers tend to absorb water and form a gel that improves stool firmness and feeds beneficial bacteria, while insoluble fibers add bulk and can speed intestinal transit. Clinical trials and veterinary case reports over recent years have demonstrated benefits for constipation relief, improved stool quality in chronic diarrhea, and enhanced satiety to assist weight-control plans when combined with calorie management.

Psyllium husk (a soluble, gel-forming fiber) has been shown in veterinary studies to reduce constipation and improve stool consistency when dosed appropriately for size.

Fermentable fibers such as inulin and fructooligosaccharides act as prebiotics, promoting growth of Bifidobacteria and other beneficial microbes that produce short-chain fatty acids linked to colon health.

Insoluble fibers like cellulose and some beet pulp fractions increase fecal bulk and can speed transit, useful for mild constipation or regularity.

Fiber can support weight management by increasing perceived fullness and lowering calorie density of meals when used as part of a supervised weight-loss plan.

Clinical outcomes depend on matching fiber type and dose to the problem; abrupt changes can worsen symptoms, so gradual introduction is typically recommended.

Many peer-reviewed veterinary nutrition reviews recommend combining fiber strategy with hydration, diet assessment and, where necessary, vet supervision for chronic or severe conditions.

Whether you need a short-term fix for constipation, a daily prebiotic to support gut health, or a fiber strategy to assist weight loss, the American market now offers clear, veterinarian-endorsed options in multiple formats. We hope this guide helped you find a suitable fiber supplement for your dog. Use the search to refine by form, ingredient, breed size or condition to narrow results or expand your options.