How Long Does a Tub of Dog Multivitamin Chews Last?

A tub of Biotic’s Gain 25-in-1 Dog Multivitamin Chews holds 120 soft chews, which works out at roughly four months for a typical dog — though the honest answer is that it depends entirely on your dog’s size, because the feeding guide sets the daily amount by weight. A small terrier on one chew a day will make a tub last far longer than a large breed on the top of the guide. That is the whole calculation: chews in the tub, divided by the chews your dog’s weight band calls for. Everything else that changes the answer is practical rather than nutritional — missed days, two dogs sharing one tub, storage, and whether the chew is actually being eaten.

The sum itself

There is no mystery to this one. Take the number of chews in the tub, which is 120, and divide by the number your dog is fed each day according to the feeding guide on the pack. One a day gives you four months. Two a day gives you two. Three a day gives you forty days.

Where owners get caught out is assuming this tub will last as long as the last one. It will not, if the dog has grown, if you have changed dogs, or if you were quietly giving less than the guide calls for. Working it out once saves the discovery that you have run out on a Sunday.

Why weight is the variable that matters

Feeding guides for dog supplements are banded by bodyweight for a straightforward reason: a chew delivers a fixed amount of whatever is in it, and a nine-kilogram spaniel and a forty-kilogram rottweiler are not the same animal. The bands exist so the daily amount stays sensible across that range rather than being wildly generous for one and negligible for the other.

Two practical points follow from that. The first is to weigh your dog rather than estimate. Owners are consistently out by a few kilograms in both directions, and with a dog sitting near a band boundary that can be the difference between one chew and two — which halves how long the tub lasts.

The second is to recheck after any significant change. Puppies grow through bands quickly. Older dogs sometimes lose condition and drop down one. A dog who has been on a weight-management plan for six months may well not be in the band you last looked up. Our dosage calculator will do the lookup for you if you would rather not squint at the label.

Households with more than one dog

One tub shared between two dogs empties at the combined rate of both, which sounds obvious written down and still surprises people at the checkout. Two medium dogs on two chews each is eight chews a day between them, and 120 chews disappears in a fortnight.

The bigger issue in a multi-dog house is not the maths but the distribution. Chews given loose on the floor, or dropped into a shared bowl, have a way of ending up entirely inside the quickest dog. If you are feeding more than one, hand each dog their own, or put them into separate bowls and stand there while they eat. Otherwise you have no idea who actually had what, and the tub lasting the “wrong” length of time is usually the first clue.

Storing a tub so the last chew is like the first

A soft chew is soft because it holds some moisture, and moisture is the thing you are managing over four months. A few habits are worth having:

Close the tub properly every time. A lid left half-turned on a kitchen worktop is the usual reason chews go hard by month three.
Keep it somewhere cool, dry and out of direct sunlight. A cupboard is better than a windowsill and much better than the top of the fridge.
Do not decant the whole tub into a treat jar. The packaging is doing a job, and the batch and best-before information lives on it.
Check the best-before date against how long the tub will realistically last you — that matters far more for a small dog on four months of chews than for a household emptying it in three weeks.
Keep it where the dog cannot reach it. Palatable chews in a chewable tub, left at nose height, end badly.

Missed days, holidays and kennels

If you forget a day, give the normal amount the next day. Do not double up to catch up — the feeding guide is a daily amount, not a weekly quota to be balanced out.

For boarding or a dog sitter, count out what is needed into a labelled bag rather than handing over the whole tub, and write the daily number on it. Kennels deal with a lot of dogs and a lot of well-meant verbal instructions; something written down is far more likely to be followed. The same goes for a dog who splits the week between two households.

What “complementary feed” means for how you use a tub

These chews are a complementary feed, not a complete one. That is a legal category with a plain meaning: a complete food is formulated to supply everything a dog needs on its own, and a complementary feed is designed to sit alongside one. It is not a meal, it is not a replacement for a meal, and the daily amount on the guide is not a figure to be improvised with.

It also means a tub lasting exactly as long as it should is itself a small sign that things are being done properly. A tub emptying far faster than the guide predicts usually means someone in the house is treating them as treats. We have gone through the rest of the label — composition order, analytical constituents, additives — in what the label on a dog supplement actually tells you.

When to reassess rather than reorder

An empty tub is a natural prompt to stop and think, and it is worth taking. Is your dog’s food still the same? Has your vet since added anything else to the routine that overlaps? Is your dog still in the same weight band? Are they actually eating the chew, or has it been going into the bin behind your back for the last month?

Reordering on autopilot is how households end up with three part-used tubs of different things and no clear picture of what the dog is getting. Whether a multivitamin belongs in your dog’s routine at all is a question we took on separately in does my dog actually need a multivitamin.

Speak to your vet

Your vet knows your dog’s history, diet and any medication they are on, and is the right person to ask before adding a supplement or running several alongside each other. That is especially true for puppies, for older dogs, for pregnant or nursing bitches, and for any dog under treatment. If your dog is unwell, or something about them has changed, that is a conversation with your vet rather than a question about a tub of chews.

More practical guides are on our fussy eater page if getting the chew eaten in the first place is the harder part.

See the 25-in-1 Dog Multivitamin Chews