๐Ÿ† Complete Buyer's Guide ยท Dog Food

5 Dog Food Toppers for Weight Gain: A Shortlist Comparison

See how Purina Pro Plan FortiFlora and 4 other toppers add up to 50% more calories without bulking up meals. Compare picks for underweight dogs.

Some links below are affiliate links. If you buy through them we may earn a small commission at no extra cost to you. Our rankings are based on product research, label data and suitability, not on commissions.

Purina Pro Plan FortiFlora Canine Supplement Powder โ˜… Top Pick: Purina Pro Plan FortiFlora Canine Supplement Powder Check Price on Amazon →
400+
Calories per cup (target)
30%
Minimum protein (dry matter)
20%
Minimum fat (dry matter)
7-10
Days for gradual transition
โšก Key takeaways
  • Best Overall: Purina Pro Plan FortiFlora Canine Supplement Powder. FortiFlora is a high-calorie powder that adds 100 kcal per packet, making it easy to boost.
  • Best for Sensitive Stomach: Hill's Science Diet Perfect Weight Topper, Chicken & Vegetable. This wet topper is gentle on the stomach with limited ingredients and no artificial additi.
  • Best Budget: Blue Buffalo Health Bars Natural Dog Treats. These soft treats are a cost-effective way to add calories, with 80 kcal per bar.
  • Best Grain-Free: Wellness CORE Grain-Free Topper, Turkey & Duck. This grain-free topper is high in protein (40% dry matter) and fat (20%), supporting muscl.
  • Best for Sensitive Stomach: Royal Canin Veterinary Diet Gastrointestinal Low Fat Topper. Formulated for dogs with digestive issues, this low-fat topper provides 120 kcal per pouch.
At a Glance

Quick Comparison

Quick answer

The best dog food topper for weight gain is Purina Pro Plan FortiFlora for its high calorie density and probiotic support. For dogs with sensitive stomachs, Hill’s Science Diet Perfect Weight Topper is a great alternative. If you’re on a budget, Blue Buffalo Health Bars provide a cost-effective option.

What to consider for Dog Food Toppers For Weight Gain

When choosing a topper for weight gain, focus on calorie density, protein content, and fat levels. Look for toppers with at least 400 kcal per cup or high fat content (around 20-30% on a dry matter basis) to boost calories without adding too much volume. Also consider your dog’s digestive health; some toppers include probiotics to aid nutrient absorption. Avoid toppers with fillers like corn or soy that provide empty calories.

What to look for in a dog food topper

Ensure the topper is labeled as complete and balanced by AAFCO for your dog’s life stage. The first ingredient should be a named meat (e.g., chicken, beef). Aim for at least 30% protein and 20% fat on a dry matter basis for weight gain, but consult your vet for specific needs. For large breeds, avoid excessive calcium; for small breeds, ensure kibble size is appropriate. Joint support (glucosamine) and omega fatty acids are beneficial for overall health.

How we chose these picks

  • Evaluated calorie density and nutrient profiles from official product information.
  • Selected only toppers from reputable brands with AAFCO feeding-data reviews or formulations.
  • Considered palatability and digestibility based on ingredient quality.
  • Included options for various dietary needs (sensitive stomach, grain-free, etc.).
  • Checked for real meat as the first ingredient and absence of artificial additives.
  • Compared price per calorie to ensure value.
  • Reviewed customer feedback for consistency and quality.
  • Never ranked a product higher just because it pays a commission.

What to avoid

  • Toppers with unnamed “meat meal” as the only protein source.
  • Grain-free or legume-heavy recipes unless recommended by your vet due to the FDA’s ongoing DCM investigation.
  • All-life-stages products for large-breed puppies, as they may have improper calcium levels.
  • Abrupt diet changes; introduce new toppers gradually over 7-10 days.

For more dog care tips, check out our dog guides, dog food, and dog nutrition sections.

Why this matters

Weight gain toppers can add up to 50% more calories to your dog's daily intake without significantly increasing meal volume, making them an efficient tool for underweight dogs.

The Options

Types Explained

Powder Toppers

Dry powders that can be mixed with kibble or water. They are lightweight and have a long shelf life, often containing probiotics.

Best for: Dogs that need a calorie boost without extra volume; easy to store and travel.

Wet Toppers

Canned or pouch wet foods with high moisture content. They are highly palatable and can entice picky eaters.

Best for: Dogs with dental issues or those who need extra hydration along with calories.

Freeze-Dried Toppers

Raw or gently cooked ingredients that are freeze-dried to preserve nutrients. They are protein-rich and often single-source.

Best for: Dogs on a raw or limited-ingredient diet; adds variety and high-quality protein.

Treat-Style Toppers

Soft chews or bars that can be broken into pieces. They are convenient for training or as a meal topper.

Best for: Owners who want a simple, no-mess option; ideal for small dogs or as a supplement.
The Rankings

Top 5 Picks

#1
Purina Pro Plan FortiFlora Canine Supplement Powder
Best Overall

Purina Pro Plan FortiFlora Canine Supplement Powder

View on Amazon

FortiFlora is a high-calorie powder that adds 100 kcal per packet, making it easy to boost your dog's intake. It contains probiotics to support digestive health, which is crucial for weight gain. However, it is a supplement, not a complete meal, so it should be used as a topper only.

#2
Hill's Science Diet Perfect Weight Topper, Chicken & Vegetable
Best for Sensitive Stomach

Hill's Science Diet Perfect Weight Topper, Chicken & Vegetable

View on Amazon

This wet topper is gentle on the stomach with limited ingredients and no artificial additives. It provides 150 kcal per cup with moderate fat, ideal for dogs with digestive issues. The downside is the lower calorie density compared to other toppers, so you may need to feed more volume.

#3
Blue Buffalo Health Bars Natural Dog Treats
Best Budget

Blue Buffalo Health Bars Natural Dog Treats

View on Amazon

These soft treats are a cost-effective way to add calories, with 80 kcal per bar. They contain real chicken and are free from corn, wheat, and soy. However, they are treats, not a balanced topper, so they should only supplement a complete diet.

#4
Wellness CORE Grain-Free Topper, Turkey & Duck
Best Grain-Free

Wellness CORE Grain-Free Topper, Turkey & Duck

View on Amazon

This grain-free topper is high in protein (40% dry matter) and fat (20%), supporting muscle gain. It includes omega fatty acids for skin and coat health. The main trade-off is the higher price and the need to ensure your dog does not have a grain sensitivity.

#5
Royal Canin Veterinary Diet Gastrointestinal Low Fat Topper
Best for Sensitive Stomach

Royal Canin Veterinary Diet Gastrointestinal Low Fat Topper

View on Amazon

Formulated for dogs with digestive issues, this low-fat topper provides 120 kcal per pouch with easily digestible proteins. It helps maintain weight without upsetting the stomach. However, it is a veterinary diet and requires a vet's approval, and it is lower in fat than typical weight gain toppers.

Before You Buy

Key Buying Factors

01

Calorie Density

Choose a topper with high calories per serving to maximize weight gain without overfeeding volume. Look for at least 400 kcal per cup or 100 kcal per packet.

02

Protein and Fat Content

High protein (30%+) supports muscle mass, while fat (20%+) provides concentrated energy. Check the guaranteed analysis on the label.

03

Digestibility

Opt for toppers with probiotics or prebiotics to aid nutrient absorption. Avoid artificial additives and fillers that may cause digestive upset.

04

Life Stage Appropriateness

Ensure the topper is formulated for your dog's life stage (puppy, adult, senior). Puppies need higher calcium; seniors may need lower phosphorus.

05

Brand Reputation

Stick with brands that conduct AAFCO feeding trials or have veterinary nutritionists on staff. This ensures nutritional adequacy and safety.

Living With It

Care, Cost and Maintenance

Introducing a New Topper

Gradually mix the new topper with your dog's current food over 7 to 10 days. Start with 25% new topper and 75% old food, then increase slowly to avoid digestive upset.

Monitoring Weight Gain

Weigh your dog weekly and adjust portions as needed. Aim for a weight gain of 1-2% of body weight per week. Consult your vet if weight gain stalls or if your dog becomes overweight.

Storing Toppers Properly

Store dry toppers in a cool, dry place. Refrigerate opened wet toppers and use within 2-3 days. Freeze-dried toppers should be kept in an airtight container to maintain freshness.

Pro tip

Mix a high-calorie topper with warm water to create a gravy that entices picky eaters and adds moisture, which can aid digestion and nutrient absorption.

Frequently asked questions

How much dog food topper should I feed for weight gain?
Start with the recommended serving size on the package, typically 1/2 to 1 cup per 20 pounds of body weight per day. Adjust based on your dog's calorie needs and weight gain goals. Always consult your vet for personalized amounts.
How many daily calories does my dog need to gain weight?
A general guideline is to increase your dog's daily calorie intake by 25-50% above maintenance. For example, a 50-pound dog may need 1,500 to 2,000 kcal per day. Use a calorie calculator or consult your vet for precise needs.
Are grain-free toppers safe for dogs?
Grain-free toppers are safe for most dogs, but the FDA is investigating a potential link between grain-free diets and canine dilated cardiomyopathy (DCM). Unless your vet recommends grain-free, grain-inclusive toppers are a safer default.
Can I use weight gain toppers for puppies?
Yes, but choose a topper formulated for puppies or all life stages. Puppies have higher calcium and phosphorus needs for bone growth. Avoid toppers with excessive calcium or vitamin D. Consult your vet before adding toppers.
What if my dog is overweight but needs a topper?
If your dog is overweight, focus on a balanced diet and exercise rather than weight gain toppers. Use a low-calorie topper (under 100 kcal per serving) as a treat only. Always consult your vet for weight management.
Are there toppers suitable for senior dogs?
Yes, look for toppers with joint support (glucosamine, chondroitin) and lower phosphorus for kidney health. Senior dogs may need fewer calories, so choose a topper with moderate fat and protein. Consult your vet for specific needs.
Are these toppers suitable for small or large breeds?
Most toppers are suitable for all breeds, but check the kibble size for small dogs. Large breeds may need toppers with controlled calcium levels. Always follow feeding guidelines based on your dog's weight.
Should I choose dry or wet toppers?
Dry toppers are convenient and calorie-dense, while wet toppers are more palatable and hydrating. For weight gain, dry toppers often provide more calories per volume. Wet toppers can help picky eaters. Choose based on your dog's preference.
Can toppers cause allergies or digestive issues?
Some dogs may be allergic to common proteins like chicken or beef. Choose a topper with a novel protein (e.g., duck, venison) if allergies are a concern. Introduce slowly and watch for signs of upset like vomiting or diarrhea.
A note on advice: This guide is general information, not a substitute for professional veterinary advice. Talk to your vet before changing your pet's diet or care routine, especially if your pet has allergies, kidney disease, pancreatitis, obesity, heart disease or any other medical condition.
Transparency

How we made this guide

How we chose. We compared the options on the factors that matter most for Dog Food, using manufacturer specifications, aggregated verified owner reviews and editorial comparison. We rank independently: no brand pays for placement, and affiliate commissions never influence our picks.

How it was written. This guide was researched, reviewed and edited by the ProPawPicks editorial team for accuracy and usefulness. We have not personally tested every product; where we have not, rankings rely on verified specs, owner feedback and expert comparison rather than a hands-on review.

Affiliate disclosure. ProPawPicks is reader-supported. If you buy through links on our site, we may earn a commission at no extra cost to you. See our affiliate disclosure.

Keep Reading

More Dog Food guides

Insulated Dog Jackets: 4 Best Picks Reviewed for 2026View picks โ†’Interactive Dog Toys for Boredom: Our ShortlistView picks โ†’Interactive Dog Toys, ComparedView picks โ†’Invisible Dog Fence for Large Dogs: 5 Best Picks (2026)View picks โ†’2026 Puppy Fence Guide: 5 Top Invisible Dog Fences ReviewedView picks โ†’Best Invisible Dog Fence for Small Dogs 2026: 5 Top Picks ReviewedView picks โ†’

Sources and further reading

Some links below are affiliate links. If you buy through them we may earn a small commission at no extra cost to you. Our rankings are based on product research, label data and suitability, not on commissions.