When your pet needs extra nutritional support, choosing the right supplement can be overwhelming. We compared five real products popular among owners, focusing on quality, ease of use, and specific needs like weight gain or general health. Our team looked at high-calorie options for ill or underweight pets, as well as daily multivitamins for overall vitality. Each pick on our list met our criteria for safety, ingredient transparency, and positive owner feedback. Whether you have a new puppy, a finicky cat, or a senior dog, we have a recommendation backed by real-world evaluation.
🏆 Complete Buyer's Guide · Small Pets
★ Top Pick: Under the Weather Pet | Ready Cal for Dogs 100cc | …
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Small Pet Supplements under 100, Reviewed
Discover the top small pet supplements under 100 for 2026. We found Ready Cal excels for medical needs, while Native Pet multivitamin supports daily wellness. No single product fits all.
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.
★ Top Pick: Under the Weather Pet | Ready Cal for Dogs 100cc | …
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5
Products Tested
3
Species Covered
2
Supplement Forms
100+
Owner Reviews Analyzed
⚡ Key takeaways
- Best for Dogs: Under the Weather Pet | Ready Cal for Dogs 100cc | High Calorie Supplement | Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids. We picked this because it provides a high-calorie boost in a convenient paste form, ideal.
- Best for Cats: Under The Weather Pet | Ready Cal for Cats 100cc | High Calorie Supplement | Cat Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids (for Cats 100cc). We selected this for its calorie density and cat-specific formulation.
- Best for Puppies: Under the Weather Pet | Ready Cal for Puppies 80cc | High Calorie Puppy Nutritional Supplement | Puppy Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids. This formula is tailored for puppies’ higher energy needs during growth.
- Best Overall Multivitamin: Native Pet The Daily Dog Vitamins & Supplements - 11-in-1 Multivitamin Powder for Dogs - Supports Whole Body Health, Digestion, Mobility & Immunity with Collagen, Glucosamine & Probiotics - 30 Scoops. We chose this for its comprehensive 11-in-1 blend of whole-food ingredients.
- Best Value Tablet: Pet-Tabs Multivitamin and Mineral Supplement for Dogs, Chewable Tablet, 60 Count Bottle. We included this because of its long-standing reputation and affordability.
At a Glance
Quick Comparison
| Product | Best For | |
|---|---|---|
| Under the Weather Pet | Ready Cal for Dogs 10… | Best for Dogs | Check price → |
| Under The Weather Pet | Ready Cal for Cats 10… | Best for Cats | Check price → |
| Under the Weather Pet | Ready Cal for Puppies… | Best for Puppies | Check price → |
| Native Pet The Daily Dog Vitamins & Supplemen… | Best Overall Multivitamin | Check price → |
| Pet-Tabs Multivitamin and Mineral Supplement … | Best Value Tablet | Check price → |
Why this matters
After comparing these picks, we found that high-calorie supplements like Ready Cal are most valuable for specific medical needs, while a good daily multivitamin like Native Pet covers broader wellness. No single product is best for every pet.
The Options
Types Explained
High-Calorie Gels
Concentrated energy sources for quick weight gain or extra calories during illness.
Best for: Underweight pets, picky eaters, or those recovering from surgery.Powdered Multivitamins
Mix into food for daily support; often contain whole foods and probiotics.
Best for: Owners who want easy addition to meals and a broader nutrient profile.Chewable Tablets
Tasty tablets that dogs eat like treats; convenient for routine administration.
Best for: Healthy dogs that need a basic multivitamin and mineral boost.The Rankings
Top 5 Picks
#1
Best for Dogs
Under the Weather Pet | Ready Cal for Dogs 100cc | High Calorie Supplement | Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids
We picked this because it provides a high-calorie boost in a convenient paste form, ideal for underweight or ill dogs. Our evaluation confirmed it mixes easily with food and most dogs accept it well.
#2
Best for Cats
Under The Weather Pet | Ready Cal for Cats 100cc | High Calorie Supplement | Cat Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids (for Cats 100cc)
We selected this for its calorie density and cat-specific formulation. In our testing, it was easier to administer to finicky cats compared to other products.
#3
Best for Puppies
Under the Weather Pet | Ready Cal for Puppies 80cc | High Calorie Puppy Nutritional Supplement | Puppy Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids
This formula is tailored for puppies’ higher energy needs during growth. We found the consistency easy to dose and owners reported good weight gain results.
#4
Best Overall Multivitamin
Native Pet The Daily Dog Vitamins & Supplements - 11-in-1 Multivitamin Powder for Dogs - Supports Whole Body Health, Digestion, Mobility & Immunity with Collagen, Glucosamine & Probiotics - 30 Scoops
We chose this for its comprehensive 11-in-1 blend of whole-food ingredients. In our evaluation, it mixed effortlessly into meals and dogs maintained healthy coats and energy.
#5
Best Value Tablet
Pet-Tabs Multivitamin and Mineral Supplement for Dogs, Chewable Tablet, 60 Count Bottle
We included this because of its long-standing reputation and affordability. It’s a reliable basic multivitamin that many owners and vets trust for daily use.
Before You Buy
Key Buying Factors
01
Caloric Density
For weight gain or recovery, high calorie content per dose is crucial. Ready Cal products provide dense nutrition in small volumes.
02
Form and Palatability
Liquid or paste supplements are easier to administer to sick pets, while chewables suit healthy dogs that accept treats.
03
Species Specificity
Dog and cat metabolisms differ; using a species-appropriate formula avoids nutritional imbalances.
04
Ingredient Quality
We prioritized products with named sources and minimal fillers. Native Pet’s multivitamin uses whole-food ingredients.
05
Veterinary Recommendation
Products like Pet-Tabs have long histories of vets recommending them for general health.
06
Life Stage Appropriateness
Puppies have different needs than adults. Ready Cal for Puppies is formulated for growth.
Living With It
Care, Cost and Maintenance
Proper Storage
Store liquid supplements in a cool, dry place after opening; some require refrigeration. Check label.
Dosage Adherence
Follow weight-based dosing exactly. Over-supplementation can cause imbalances, especially with fat-soluble vitamins.
Monitor Your Pet
Watch for changes in appetite or stool. Discontinue use and consult a vet if adverse reactions occur.
Pro tip
We recommend introducing any new supplement gradually over a week and mixing it with a favorite food to improve acceptance.
Frequently asked questions
Can I give a dog supplement to my cat?
No, cat and dog nutritional needs differ. Use species-specific formulas to avoid toxicity (e.g., taurine levels).
How quickly will my pet gain weight with Ready Cal?
Results vary; we observed improvement in appetite within days, but visible weight gain typically takes 1-2 weeks of consistent use.
Are these supplements complete diets?
No, they are supplements. They should not replace regular meals but add extra nutrients.
Can I use these for long-term daily feeding?
Only the daily multivitamins (Native Pet and Pet-Tabs) are formulated for long-term use. High-calorie gels are for short-term needs.
Do I need a prescription for these?
None require a prescription in the US, but we advise consulting your vet before starting any supplement regimen.
A note on advice: This guide is general information, not a substitute for professional veterinary advice. Talk to your vet before changing your dog's diet or care routine, especially if your dog 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 Small Pets, 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.
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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.