How to work out what a pet supplement costs per day

To work out what a pet supplement costs per day, find the daily amount for your pet's weight on the label, work out how many days the container lasts at that amount, and divide the price by the number of days. For example, a $58.99 bag of 200 chews given at 4 chews a day lasts 50 days, which is $1.18 a day. The shelf price tells you what you pay today. The cost per day tells you what the product costs to give.

Below is the method in three steps, followed by worked examples using Trueleaf products for dogs of 20 lb, 40 lb and 60 lb, and a cat. All prices are in Canadian dollars and were checked on September 30, 2026. Shipping and tax are not included.

How do you work out the cost per day of a pet supplement?

1. Find the daily amount for your pet's weight. Look for the dosing table on the label or the brand's website. It is usually set out in weight bands, so find the band your pet falls into. Note the unit: chews, tablets, scoops, grams or millilitres.
2. Count the units in the container. The label gives the count (200 chews), the weight (600g) or the volume (237 mL). Use the count when there is one. For a liquid, use the volume.
3. Divide. Units in the container divided by units per day gives the number of days. Price divided by days gives the cost per day.

As a single line: cost per day = price ÷ (units in the container ÷ units per day).

Another way to get the same number is to work out the cost of one unit first, then multiply by the units per day. A $58.99 bag of 200 chews is about $0.29 a chew, and 4 chews a day is $1.18.

A note on rounding: our dosing chart shows how long each bag or bottle lasts in whole days, rounded down. In the tables below we use the exact figure, such as 16.5 days, so the cost per day is accurate to the cent.

What do Trueleaf Calming Support Chews cost per day?

Calming Support Chews for dogs are dosed at one chew per 10 lb a day, split between morning and evening. On our dosing chart, a 20 lb dog takes 2 chews, a 40 lb dog takes 4 and a 60 lb dog takes 6.

What do Trueleaf Hip + Joint Support Chews cost per day?

Hip + Joint Support Chews are dosed at one chew per 8 lb a day, also split between morning and evening. On the bag, a 20 lb dog takes 2.5 chews, a 40 lb dog takes 5 and a 60 lb dog takes 7.5. For the first 10 days the bag says to give twice the daily amount, so the first bag runs out sooner. The bags and prices are the same as Calming Support, but the daily count is higher, so each bag lasts fewer days.

What does a Trueleaf oil cost per day?

Our oils come in 237 mL bottles and are given once a day, poured over food. The daily amount is 2.5 mL for dogs 10 to 25 lb, 5 mL for 26 to 50 lb and 7.5 mL for 51 to 70 lb. Calming Support Oil and Hip + Joint Support Oil are $44.99. Immune + Allergy Support Oil is $47.99.

At these weights the oils cost less per day than the chews. Price is one factor among several. Our guide on chews or oil covers the other differences.

What does a cat supplement cost per day?

Our cat chews come in 50g bags of 100 chews, at $9.99 a bag or $26.99 for a 3-pack (about 300 chews). For a 10 lb cat, our dosing chart gives 2 chews a day for Calming Support and 4 chews a day for Senior Support or Hairball Support. Cat chews are not split. Follow the cat label as it reads.

For other cat weights, see our guide on cat supplements and how much to give.

Why do bigger bags cost less per day?

Because the price per chew drops as the bag gets bigger. The daily count stays the same, so a lower price per chew means a lower cost per day.

The bigger the dog, the more this matters. At 60 lb on Hip + Joint Support, the 90g bag costs $3.75 a day and lasts four days. The 600g bag costs $2.21 a day and lasts about 27 days. The 90g bag is still a sensible way to see whether your dog takes to the chew before you buy a larger size.

How does Subscribe & Save change the cost per day?

Subscribe & Save takes 20% off the price on products that offer it, and the cost per day drops by the same 20%. On subscription the 600g dog chew bag is $47.19, the $44.99 oils are $35.99, the Immune + Allergy Support Oil is $38.39 and the cat 3-pack is $21.59.

For a 10 lb cat, the subscribed 3-pack comes to $0.14 a day for Calming Support and $0.29 a day for Senior or Hairball Support. You can pause, skip a delivery or cancel from your account, and we can change how often it arrives if you ask.

What should you check besides cost per day?

Cost per day is a fair way to compare containers of different sizes, but it only compares like with like when the daily amounts come from the same kind of label. Before you buy, also check the ingredient panel and the amount of each ingredient per unit. Our guide on how to read a pet supplement label shows where to find them. If you are not sure which product fits your pet, the supplement finder will point you to one.