How Much to Feed a 35 lb Dog - Portion and Cost

How much food a dog or a cat actually needs in a day

Feeding guides on the bag are written for a weight range, not for your animal. This calculator works the other way round: it takes body weight, life stage and activity level, converts them into a daily calorie figure, then divides by the energy density of the food in your cupboard. A 55 lb adult Labrador on two moderate walks a day needs about 1,250 kcal, which is 329 g of standard dry kibble, or 11.6 oz on a kitchen scale. Switch that same dog to wet food and the number jumps to 1,389 g a day, because canned food is roughly three quarters water.

Quick start: weigh the pet, pick the life stage, be honest about activity, then choose the food type. The number that comes out is the total for the whole day, not per meal. Weigh it on a kitchen scale once, mark the level on your usual cup, and you never have to weigh again.

How to work out the portion, step by step

Pet - species, and for dogs the size band. Small is under 22 lb, medium 22 to 55 lb, large above that. Cats are calculated separately because their maintenance factors are lower.
Body weight - the current weight, in pounds or kilograms. Weigh yourself holding the pet, then alone, and subtract.
Life stage - growth roughly doubles the requirement, senior status trims it by 10 to 20 percent.
Activity level - low for an indoor cat or a dog with potty walks only, moderate for two real walks a day, high for working and sporting animals.
Food type - dry, wet or a half and half mix. This is the step that decides whether the answer reads 329 g or 1,389 g.
Food grade - economy, standard or premium. Changes the monthly bill, never the portion.
Read the results - daily portion, meals per day, cost per month, packages per month, and the calorie breakdown underneath.

Nine feeding cases worked through

Case 1: the six pound lap dog

Situation: small dog, 6 lb, adult, low activity, standard dry
Result: 55 g (1.9 oz) a day, about $7 a month

Two thirds of a standard measuring cup. Toy breeds are the easiest to overfeed because a single extra treat can be a fifth of the daily budget.

Case 2: the average Beagle

Situation: medium dog, 25 lb, adult, moderate activity, standard dry
Result: 182 g (6.4 oz) a day, about $22.87 a month

A single 30 lb bag covers about two and a half months for this dog.

Case 3: the working Labrador on premium food

Situation: large dog, 70 lb, adult, high activity, premium dry
Result: 493 g (17.4 oz) a day, about $123.90 a month

Same dog on economy kibble would eat the same weight and cost roughly $27.72 a month. The grade changes the bill, not the bowl.

Case 4: a seven month old German Shepherd

Situation: large dog, 45 lb, puppy, moderate activity, standard dry
Result: 442 g (15.6 oz) a day, about $55.54 a month

A growing puppy at 45 lb eats 442 g, more than a finished adult of the same weight on a moderate day would. That is the growth factor of 2.5 x RER doing the work.

Case 5: the slowing down Golden Retriever

Situation: large dog, 65 lb, senior, low activity, standard dry
Result: 280 g (9.9 oz) a day, about $35.19 a month

The same dog five years earlier, moderately active, would have eaten 373 g. Keeping the old portion after the walks get shorter is how senior dogs gain weight.

Case 6: the indoor cat on kibble

Situation: cat, 10 lb, adult, low activity, standard dry
Result: 69 g (2.4 oz) a day, about $11.41 a month

That is around 261 kcal, which lines up with the usual guidance for a neutered indoor cat. Free feeding a full bowl typically delivers twice that.

Case 7: the all wet fed cat

Situation: cat, 12 lb, adult, moderate activity, standard wet
Result: 388 g (13.7 oz) a day, 137 cans of 3 oz, about $110.35 a month

Between four and five small cans a day. This is the number that surprises people who switch a cat to wet food for the hydration benefit.

Case 8: a four pound kitten

Situation: cat, 4 lb, kitten, moderate activity, standard wet
Result: 304 g (10.7 oz) a day, 108 cans of 3 oz, about $86.46 a month

A kitten weighing a third of the adult cat above eats about four fifths as much. Split it over three or four meals, a kitten stomach cannot hold that in two sittings.

Case 9: the half and half feeder

Situation: medium dog, 35 lb, adult, moderate activity, standard mix
Result: 379 g (13.4 oz) a day, 1 bag of 30 lb plus 16 cans of 13 oz a month

Same dog on dry alone would eat 234 g, so the mixed bowl is over 60 percent heavier. Mixing is not wrong, but the bowl has to get visibly bigger or the dog is under fed.

Daily calories by body weight

The base figure is the resting energy requirement, RER = 70 x weight in kg to the power 0.75. Everything else is a multiplier on top. The dry food column below assumes a standard kibble at 380 kcal per 100 g.

Body weight	RER	Adult dog, moderate	Dry food per day
5 lb (2.3 kg)	129 kcal	207 kcal	54 g (1.9 oz)
10 lb (4.5 kg)	218 kcal	348 kcal	92 g (3.2 oz)
20 lb (9.1 kg)	366 kcal	585 kcal	154 g (5.4 oz)
30 lb (13.6 kg)	496 kcal	794 kcal	209 g (7.4 oz)
40 lb (18.1 kg)	615 kcal	985 kcal	259 g (9.1 oz)
55 lb (24.9 kg)	781 kcal	1,250 kcal	329 g (11.6 oz)
70 lb (31.8 kg)	936 kcal	1,498 kcal	394 g (13.9 oz)
90 lb (40.8 kg)	1,131 kcal	1,809 kcal	476 g (16.8 oz)

Life stage and activity factors

These are the multipliers applied to RER. Dogs and cats do not share a column, which is the single most common mistake in generic feeding charts: an adult indoor cat sits at 1.2 x RER while an adult dog on the same activity level sits at 1.4 x RER.

Life stage	Activity	Dog factor	Cat factor
Puppy or kitten	any	2.50	2.50
Young adult	low or moderate	1.80	1.40
Young adult	high	2.00	1.60
Adult	low	1.40	1.20
Adult	moderate	1.60	1.40
Adult	high	2.00	1.60
Senior	low	1.20	1.10
Senior	moderate	1.30	1.20
Senior	high	1.40	1.40

Food energy and what a month costs

Food type	Energy	Dog, price per lb	Cat, price per lb
Dry, economy	380 kcal / 100 g	$0.85	$1.20
Dry, standard	380 kcal / 100 g	$1.90	$2.50
Dry, premium	380 kcal / 100 g	$3.80	$4.80
Wet, economy	90 kcal / 100 g	$2.00	$2.60
Wet, standard	90 kcal / 100 g	$3.20	$4.30
Wet, premium	90 kcal / 100 g	$5.00	$6.90
Mix, half and half	235 kcal / 100 g	average of the two	average of the two

Prices are typical US retail averages across bag and can sizes. Energy density varies by brand, so check the label: a high fat performance kibble can run 450 kcal per 100 g and a light formula can drop to 320 kcal per 100 g.

FAQ

How many cups is the portion the calculator gives me?

A standard 8 fl oz measuring cup holds roughly 100 to 120 g of dry kibble, but that swings with kibble shape and density. Small round kibble packs tighter than large flat pieces, and the gap between two brands can be 25 percent. Weigh one cup of your own food once on a kitchen scale, write the number on the bag, and convert from there.

Why is my result lower than the feeding guide on the bag?

Bag guides are written for a weight band and usually assume an intact, moderately active animal, because under feeding generates complaints and over feeding does not. The calculator uses your actual weight and activity level. For a neutered indoor pet the difference is commonly 15 to 25 percent.

Should I enter current weight or the weight I want my pet to reach?

Enter the current weight. For weight loss, take the result and cut it by 10 percent, then reweigh in two weeks. A safe loss rate is 1 to 2 percent of body weight per week for dogs and closer to 0.5 to 1 percent for cats, because cats that drop weight fast risk hepatic lipidosis.

Do treats count against the daily portion?

Yes. The standard rule is that treats stay under 10 percent of daily calories, and the food portion drops by the same amount. For the 6 lb dog in case 1 that is 21 kcal, which is about half a small dental chew. This is the single most common reason a correctly calculated portion still leads to weight gain.

Why does the wet food number look so large?

Canned food is about 75 percent water. At roughly 90 kcal per 100 g against 380 kcal per 100 g for kibble, the same animal has to eat about 4.2 times the weight to get the same energy. The bowl looks alarming, the calories are identical.

How do I check whether the portion is right?

Use body condition, not the scale alone. Ribs should be easy to feel under a thin fat layer, there should be a visible waist from above and a tucked abdomen from the side. If ribs are visible from across the room, add 10 percent. If you cannot find them at all, remove 10 percent. Recheck every two weeks.

How many meals a day should a puppy or kitten get?

Three to four. A young animal needs roughly 2.5 times its resting requirement and does not have the stomach capacity to take that in two sittings. From about six months you can move to three, and from twelve months two meals is normal for most dogs. Cats do better on more, smaller meals for life.

Does the calculator work for pregnant, nursing or sick animals?

No. Gestation, lactation, recovery from surgery and chronic disease all move the requirement well outside the factors used here, and lactation alone can reach 4 to 6 times RER. Those cases need a vet designed plan, not a general formula.

Related tools

Pet Age Calculator

Tells you whether your dog or cat has crossed into the senior band, which is the switch that cuts this portion by 10 to 20 percent. Open calculator

Pet Water Calculator

Daily water need for the same animal, which moves sharply depending on whether you feed dry kibble or wet food. Open calculator

How much to feed a 35 lb dog - portion, meals and cost

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