Yes, if the label says the product is made for both cats and dogs. Sharing a container is fine; sharing a serving is not. Each animal gets its own weight-based amount, the cat usually needs a much smaller starting portion, and both pets should be cleared by a vet, especially a cat with kidney, thyroid, or chronic gut issues.
Check the label before anything else
Some digestive supplements are formulated and labeled for dogs only. Others are explicitly made for both species. The difference matters, because cats process certain compounds differently from dogs and are more sensitive to some ingredients, flavorings, and additives that dogs tolerate easily.
If a label says dogs only, do not share it with a cat, even if the ingredients look harmless. If it says cats and dogs, the maker has at least considered both species when choosing ingredients and serving guidance.
Super Snouts G.I. Balance is labeled for cats and dogs of all sizes, ages six months and up. Its product page lists pumpkin, apple pectin, organic fennel seed, ginger, and organic agave inulin, with no flavorings or preservatives named in the listing.
It helps to think about what each ingredient means for each species. Pumpkin and apple pectin are fiber sources, and cats generally handle small amounts of fiber well, which is why pumpkin shows up in many feline digestive products. Agave inulin is a fermentable fiber that both species' gut bacteria can use, though too much at once tends to cause gas. Fennel seed and ginger are botanicals used in small quantities; cats are more particular about strong smells, so these may affect acceptance more than tolerance. None of that replaces a vet's view of your particular animals, but it explains why a cat's starting amount should be small and why the dog's experience with the product is not a preview of the cat's.
Portion by animal, not by container
The serving chart on the G.I. Balance page is for once-daily use and runs by weight: one to three teaspoons in the smallest band, one to two tablespoons from 25 to 50 pounds, two to three tablespoons from 50 to 75, and three to five tablespoons for 75 pounds and up. The smallest band is printed on the page as "> 25 Lbs," which appears to mean under 25 pounds; ask the company if you want that confirmed.
For a typical 10-pound cat sharing with a 60-pound dog, the gap in amounts is large. The dog's daily serving may be measured in tablespoons while the cat starts at a fraction of a teaspoon. Many owners begin a cat at the lowest end of the smallest band, or below it, and increase slowly while watching stool and appetite.
Why the cat needs extra care
Cats eat small meals, often over the course of the day, and are quick to reject food that smells or tastes different. A large amount of powder can lead to a skipped meal, and skipped meals carry more risk for a cat than for a dog. Mixing the powder thoroughly into wet food and starting tiny reduces the chance of refusal.
Cornell's Feline Health Center guide to feeding your cat is a good reminder of how differently cats approach food and why changes should be gradual.
Cats with chronic conditions also need individual advice. A cat with kidney disease, hyperthyroidism, diabetes, or inflammatory bowel disease may be on a carefully built diet that a vet does not want altered. Check with your vet before adding any supplement in those cases.
Household habits that head off mix-ups
Use two scoops of different sizes or colors, one for each pet, and keep them with the container. A teaspoon measure for the cat and a tablespoon measure for the dog makes the difference obvious.
Prepare meals in separate spots. Dogs are famous for finishing a cat's bowl, which means a dog may get extra while the cat gets none. Feed the cat on a counter or in a room the dog cannot reach.
Write the amounts on the lid with a marker, especially if more than one person feeds the pets. A sticky note on the cupboard door with each pet's name and amount works too.
Keep the container sealed and dry. Powdered supplements can clump when exposed to humidity, which makes accurate measuring harder.
Time the start sensibly. Begin with one pet first, wait several days, then add the second, so that if anyone has a rough week you know which animal is reacting and to what. Watch each pet separately. One animal may respond well and the other may not, and that is fine. Shared containers do not require shared outcomes.
When sharing does not make sense
If only one pet has a digestive concern, there is no reason to add a supplement to the other.
If one pet is on a prescription gastrointestinal or urinary diet, ask the prescribing vet first.
If the cat is under six months, the G.I. Balance age line rules it out without a vet's advice.
If your dog is a scavenger who raids the cat's bowl, the practical problem may outweigh the convenience of a shared tub.
Questions about sharing supplements
Is ginger safe for cats?
Small amounts of ginger appear in some feline products, but cats vary in tolerance. Start very low and check with your vet first, particularly for a cat on medication.
Can I use the dog's amount and just give the cat half?
That is usually too much for a cat. Base the cat's amount on its own weight and start below the chart.
My cat refuses food with any powder in it. What now?
Try a smaller amount mixed into a strongly flavored wet food. If the cat still refuses, stop, since eating normally matters more.
Do I need two separate containers?
Not if the product is labeled for both species. Separate scoops and clear labeling usually do the job.
How long should each pet stay on it?
Judge each animal separately over a couple of weeks. If one shows no benefit, it can stop while the other continues.
Related reading: Multi-Dog Households: Managing Different Digestive Needs; G.I. Balance vs. a Plain Probiotic: What the Blend Adds; How to Read a Dog Digestive-Supplement Label (Buying Guide)