Can Dogs Eat Mushrooms?
For plain, store-bought mushrooms only: a 30 lb (13.61 kg) spayed/neutered adult dog has a 10% treat ceiling of 69.43–79.35 kcal a day. USDA lists white raw mushrooms at 22 kcal per 100 g, so that ceiling is 315.6–360.7 g (11.13–12.72 oz), or about 17.5–20.0 medium mushrooms at the official 18 g each. Wild mushrooms are a different answer: do not feed them. No wild mushroom enters any calculation on this page, and this page makes no safety claim about any mushroom — it only converts published energy densities into grams and ounces.
Recompute the ceiling for your dog
Pick an official USDA energy density and one of its household portions. Both units are shown for every result. Nothing is pre-filled from a rival page.
10% treat ceiling
—
Grams: — | Ounces: — | Portions: —
RER — kcal at — kg; density — kcal/100 g.
Switching lb → kg → lb keeps the same canonical weight in kilograms, so the result does not drift. Clearing the weight hides the result instead of printing a made-up number.
The formula, every symbol, and its supporting range
RER = 70 × kg0.75
MER = RER × 1.4–1.6
ceiling = MER × 0.1
grams = ceiling ÷ density × 100
ounces = grams ÷ 28.349523125
count = grams ÷ portion_g
Worked once in full at the default: 30 lb × 0.45359237 = 13.6078 kg; RER = 70 × kg0.75 = 495.95 kcal; × 1.4–1.6 = 694.33–793.52 kcal MER; × 0.1 = 69.43–79.35 kcal ceiling; ÷ 22 × 100 = 315.6–360.7 g; ÷ 28.349523125 = 11.13–12.72 oz; ÷ 18 g = 17.5–20.0 medium mushrooms.
| Symbol | Definition | Supporting range used here |
|---|---|---|
| lb, kg | Body weight in pounds and kilograms; 1 lb = 0.45359237 kg exactly. | 5–120 lb in the ladder; the tool accepts 2–300 lb. |
| RER | Resting energy requirement, 70 × kg0.75 kcal/day. | Published on this site's formula page. |
| MER | Maintenance energy requirement = RER × factor. | 1.4–1.6 for a typical spayed/neutered adult. |
| ceiling | The 10% treat share of MER, in kcal/day. | Exactly 0.1 × MER; a range, never a single point. |
| density | Official energy density, kcal per 100 g, from USDA SR Legacy. | 22–296 kcal/100 g across the 14 forms listed below. |
| portion_g | Official weight of one household portion, grams. | 6–96 g across 7 official portions. |
| ounces | Avoirdupois ounces; 1 oz = 28.349523125 g exactly. | Every gram figure is also shown in oz. |
One ceiling, 14 official densities, recomputed line by line
Every row uses the same 30 lb dog and the same 69.43–79.35 kcal ceiling. Only the official density changes. Grams and ounces are both printed, and the last column converts grams into 18 g medium mushrooms.
| USDA form | fdcId | kcal/100 g | Grams per day | Ounces per day | Medium mushrooms |
|---|---|---|---|---|---|
| white, raw | 169251 | 22 | 315.6–360.7 | 11.13–12.72 | 17.5–20.0 |
| white, cooked, boiled, drained, without salt | 169252 | 28 | 248.0–283.4 | 8.75–10.00 | 13.8–15.7 |
| white, stir-fried | 169253 | 26 | 267.1–305.2 | 9.42–10.77 | 14.8–17.0 |
| white, microwaved | 169402 | 35 | 198.4–226.7 | 7.00–8.00 | 11.0–12.6 |
| canned, drained solids | 169254 | 25 | 277.7–317.4 | 9.80–11.20 | 15.4–17.6 |
| portabella, raw | 169255 | 22 | 315.6–360.7 | 11.13–12.72 | 17.5–20.0 |
| portabella, grilled | 169243 | 29 | 239.4–273.6 | 8.45–9.65 | 13.3–15.2 |
| brown, italian, or crimini, raw | 168434 | 22 | 315.6–360.7 | 11.13–12.72 | 17.5–20.0 |
| shiitake, raw | 169242 | 34 | 204.2–233.4 | 7.20–8.23 | 11.3–13.0 |
| shiitake, stir-fried | 168435 | 39 | 178.0–203.5 | 6.28–7.18 | 9.9–11.3 |
| shiitake, dried | 168436 | 296 | 23.5–26.8 | 0.83–0.95 | 1.3–1.5 |
| enoki, raw | 169382 | 37 | 187.7–214.5 | 6.62–7.57 | 10.4–11.9 |
| oyster, raw | 168580 | 33 | 210.4–240.5 | 7.42–8.48 | 11.7–13.4 |
| maitake, raw | 169403 | 31 | 224.0–256.0 | 7.90–9.03 | 12.4–14.2 |
Dried shiitake at 296 kcal/100 g is 13.45× the density of white raw at 22: the same ceiling becomes only 23.5–26.8 g (0.83–0.95 oz). kJ values on the same official records cross-check the kcal figures (93 kJ for 22 kcal, 1240 kJ for 296 kcal).
Official household portions turned into kcal
USDA's detail record for white raw mushrooms prints these gram weights. Each is converted at 22 kcal/100 g and shown as a share of the 30 lb ceiling.
| Official portion | Grams | kcal | Share of ceiling |
|---|---|---|---|
| slice | 6 | 1.32 | 1.66–1.90% |
| small | 10 | 2.20 | 2.77–3.17% |
| medium | 18 | 3.96 | 4.99–5.70% |
| large | 23 | 5.06 | 6.38–7.29% |
| cup pieces | 35 | 7.70 | 9.70–11.09% |
| cup, pieces or slices | 70 | 15.40 | 19.41–22.18% |
| cup, whole | 96 | 21.12 | 26.62–30.42% |
Recomputing the three qualitative serving bands
The number-two ranking page gives three bands by dog size: a quarter to a half of a small mushroom, a half to one small mushroom, and one whole small mushroom. No gram weight or calorie figure is attached. Mapping its "small mushroom" to USDA's official small portion (10 g) and applying 22 kcal/100 g gives the numbers below. The percentages compare each band against the same 30 lb ceiling, so they are a common reference, not a per-band recommendation.
| Band | Grams | Ounces | kcal | Share of 30 lb ceiling |
|---|---|---|---|---|
| Small dogs | 2.50–5.00 | 0.09–0.18 | 0.55–1.10 | 0.7–1.6% |
| Medium dogs | 5.00–10.00 | 0.18–0.35 | 1.10–2.20 | 1.4–3.2% |
| Large dogs | 10.00–10.00 | 0.35–0.35 | 2.20–2.20 | 2.8–3.2% |
The largest of the three bands is 2.20 kcal, or 3.2% of the lower end of the ceiling. That is a recomputation of a published qualitative band, not a feeding instruction and not a safety threshold.
Weight ladder at white raw density
| Body weight | kcal ceiling per day | Grams per day | Ounces per day | Medium mushrooms |
|---|---|---|---|---|
| 5 lb | 18.11–20.70 | 82.3–94.1 | 2.90–3.32 | 4.6–5.2 |
| 10 lb | 30.46–34.81 | 138.5–158.2 | 4.88–5.58 | 7.7–8.8 |
| 20 lb | 51.23–58.55 | 232.8–266.1 | 8.21–9.39 | 12.9–14.8 |
| 30 lb | 69.43–79.35 | 315.6–360.7 | 11.13–12.72 | 17.5–20.0 |
| 50 lb | 101.85–116.40 | 462.9–529.1 | 16.33–18.66 | 25.7–29.4 |
| 80 lb | 144.89–165.59 | 658.6–752.7 | 23.23–26.55 | 36.6–41.8 |
| 120 lb | 196.39–224.44 | 892.7–1020.2 | 31.49–35.99 | 49.6–56.7 |
The 1.4–1.6 band is applied at both ends; ceilings use the same band throughout.
What the three top-ranking pages leave out
Read on 12 November 2026 from a real search result set. All three are readable; none prints a calorie figure, a density, a gram or ounce amount, or a formula.
- No page converts "moderation" or the 10% rule into a weight-dependent kcal/day ceiling.
- No page states an energy density in kcal per 100 g with an official source.
- No page gives grams or ounces; the only quantitative serving advice is a fraction of a mushroom with no gram weight.
- No page publishes a formula, a coefficient, a symbol definition, or a supporting range.
- No page recomputes its own serving bands into kcal or into a share of a daily ceiling.
- No page quantifies its own warning against dried mushrooms with a dry-to-raw density ratio.
- No page separates the wild-mushroom answer from the store-bought answer before doing arithmetic.
Titles and wording here are paraphrases, not quotations. One readable page out of three was enough to establish the shared gap; all three were in fact readable this round.
What this page deliberately does not do
- No wild mushrooms. This page does not identify species, judge toxicity, estimate a toxic dose, or list symptoms. No wild mushroom enters any calculation here.
- No safety claim. It never says a mushroom is guaranteed safe, always safe, or suitable for your dog. It converts published energy densities into grams and ounces; that is all.
- No veterinary advice. It does not diagnose, recommend treatment, or replace a veterinary team's feeding plan.
- No assumed density. It uses only densities printed by USDA SR Legacy and shown on this page. It does not invent a value for seasoned, oiled, buttered, canned-in-sauce, or mixed dishes.
- No single-point answer. Every ceiling is a range from the 1.4–1.6 factor band, not one number.
- No rival wording copied. The competing serving bands are paraphrased and then recomputed; no sentence is reproduced.
Sources
- USDA FoodData Central,
/v1/foods/searchwithdataType=SR Legacy, queried 12 November 2026: 42 hits, 40 records returned. Densities in the table above are read from this response. - USDA FoodData Central,
/v1/food/169251(Mushrooms, white, raw, SR Legacy): 22 kcal and 93 kJ per 100 g, plus the 7 official household portions above. - PawToolHub, dog calorie calculator formula: RER = 70 × kg0.75, the 1.4–1.6 adult band, and the 10% treat share.
- Exact conversions: 1 lb = 0.45359237 kg; 1 oz = 28.349523125 g.
- Three top-ranking pages for this query, read 12 November 2026 (AKC, Purina UK, VEG ER for Pets): used only for the qualitative serving bands and the shared-gap list, never as a numeric source.
FAQ
Can dogs have mushrooms at all?
That question has two answers. Wild mushrooms are not something to feed, and this page does not evaluate them. For plain, store-bought mushrooms, the arithmetic above converts a 10% calorie ceiling into 315.6–360.7 g for a 30 lb adult dog at 22 kcal per 100 g. This is a calorie conversion, not a safety clearance.
Are mushrooms safe for dogs?
This page makes no safety claim. Species identification, toxicity and symptoms are outside its scope. It only shows what published energy densities mean in grams and ounces. If a dog may have eaten a wild mushroom, contact a veterinarian or animal poison control service promptly.
How many mushrooms can a dog eat?
At the official 18 g medium portion and 22 kcal per 100 g, the 30 lb ceiling of 69.43–79.35 kcal works out to 17.5–20.0 medium mushrooms. Change the weight, density or portion in the tool to see the range for your own inputs. "How many" is a calorie answer here, not a feeding recommendation.
Why do dried mushrooms give a much smaller gram figure?
Official density rises from 22 kcal per 100 g for white raw to 296 for dried shiitake, a factor of 13.45. Dividing the same ceiling by a larger density gives fewer grams: 23.5–26.8 g instead of 315.6–360.7 g. That is a density calculation, not advice to feed dried mushrooms.
Does the 10% ceiling come from a mushroom study?
No. It is the general treat share already published on this site's formula page, applied to MER. The mushroom-specific numbers on this page are the official USDA densities and household portions only.
Why is every result a range instead of one number?
MER uses the 1.4–1.6 adult band, so the ceiling inherits it. Both ends are evaluated and printed; a single point would hide half of the published band.
Can puppies eat mushrooms?
This calculator is built for a healthy adult dog at a healthy body condition using the 1.4–1.6 adult band. Growth-stage energy needs are outside its supporting range, so it does not produce a puppy figure.