Can Dogs Eat Raisins? No. Raisins Are Worse Per Gram Than Fresh Grapes.
Quick answer: Never. Raisins are toxic to dogs at any dose.
Why Raisins Are Worse Than Grapes Per Gram
Raisins are simply dried grapes. Fresh grapes contain approximately 80% water by weight. When they are dried to produce raisins, sultanas, or currants, that water is removed, concentrating every solid component including tartaric acid and potassium bitartrate, the compounds identified by 2022-2024 research as the likely cause of grape toxicity in dogs.
The concentration ratio is approximately 5:1: it takes about 5g of fresh grape to produce 1g of raisin. This means the toxic load per gram is roughly 5 times higher in raisins than in fresh grapes, which is reflected in the documented minimum doses:
| Substance | Min. documented AKI dose | 5 kg dog | 15 kg dog |
|---|---|---|---|
| Fresh grapes (~5g each) | ~19.6 g/kg | ~98g (~19 grapes) | ~294g (~58 grapes) |
| Raisins / sultanas (~0.5g each) | ~2.8 g/kg | ~14g (~28 raisins) | ~42g (~84 raisins) |
These are minimum documented doses from case reports, not established safe thresholds. Individual dogs have developed AKI from smaller amounts. Source: Downs et al. 2024 Vet Record; VCA Hospitals; ASPCA APCC.
Sultanas and Currants: Same Risk as Raisins
Raisins
Dried grapes, most commonly Muscat or Thompson Seedless varieties. The most common form in the US. Dark brown, wrinkled, commonly found in cereals, trail mix, baked goods.
Sultanas
Dried white (green) grapes, typically Thompson Seedless or Sultan varieties. More common in the UK. Slightly lighter in colour and sweeter than raisins. Same toxicity as raisins. Common in hot cross buns, muesli, and UK baking.
Currants
Dried Black Corinth grapes (small, seedless). Common in UK baking. Confusingly, “currants” in the US often refers to fresh blackcurrants or redcurrants (different plant, not the same toxicity risk). Zante currants are dried grapes and are toxic. If in doubt, call poison control.
Hidden Raisin Sources: Where Dogs Get Into Trouble
Most owners know not to give their dog a handful of raisins, but many dog poisonings occur because raisins are hidden in everyday foods. The following products contain raisins, sultanas, or currants and should be kept well out of reach:
Trail mix
Risk: Contains raisins and often also chocolate (separate toxicity)
Typical scenario: Left on a coffee table, opened hiking bag, sharing snacks
Breakfast cereals
Risk: Raisin Bran, muesli, granola with raisins
Typical scenario: Spilled on the floor, dog reaches the bowl
Raisin bread and cinnamon raisin bagels
Risk: Raisins throughout the bread
Typical scenario: Unattended toast, bread on low counters
Oatmeal raisin cookies
Risk: Contains multiple raisins per cookie
Typical scenario: Baked goods left on cooling racks, Christmas plates
Fruitcake
Risk: Dense with raisins, sultanas, and currants; often also contains alcohol
Typical scenario: Holiday season, Christmas gifts left accessible
Christmas pudding (UK)
Risk: Very high raisin/sultana/currant content; often brandy-soaked
Typical scenario: Christmas dinner table, leftovers in dog's reach
Mince pies (UK)
Risk: Mincemeat filling contains raisins, sultanas, currants
Typical scenario: Christmas season, left on low tables for guests
Hot cross buns (UK/AUS)
Risk: Sultanas and/or currants; some recipes also contain nutmeg (another toxin)
Typical scenario: Easter weekend, left on kitchen counters
Scones with raisins or sultanas
Risk: Common in UK bakeries and home baking
Typical scenario: Afternoon tea, visitors' bags
Protein bars
Risk: Many contain raisins or dried fruit blends
Typical scenario: Sports bags, gym kit, work desks
Stollen (German Christmas bread)
Risk: Raisins and sultanas throughout
Typical scenario: Christmas and winter holidays
Panettone (Italian)
Risk: Raisins and sultanas
Typical scenario: Christmas and New Year gifts
“My Dog Ate One Raisin” - Is That an Emergency?
For a large dog (30+ kg), one raisin (0.5g) represents approximately 0.017 g/kg, far below the documented minimum AKI threshold of 2.8 g/kg. However:
- •For a small dog (3-5 kg), one raisin represents 0.10-0.17 g/kg. Still below threshold but closer than it seems.
- •Toxicity is idiosyncratic. Documented thresholds are the LOWEST doses associated with AKI in reported cases, not a guarantee that lower doses are safe.
- •Your dog may have eaten more than you think. A raisin that fell is easily missed; dogs often eat things quickly.
The conservative and correct action: call ASPCA Animal Poison Control at (888) 426-4435. They will advise based on your dog's specific weight and the situation.
Raisins vs Grapes: Side-by-Side Comparison
| Fresh Grapes | Raisins / Sultanas / Currants | |
|---|---|---|
| Water content | ~80% | ~15-20% |
| Average weight per unit | ~5g per grape | ~0.5g per raisin |
| Documented min. AKI dose | ~19.6 g/kg | ~2.8 g/kg |
| Toxicity relative to each other | Reference | ~7x more toxic per gram |
| Time to vomiting | Within 6h | Within 6h |
| Risk to small dogs (under 5 kg) | High | Very high |
| Hidden in food products | Less common | Very common (cereal, baked goods, trail mix) |
| Safe for dogs? | No | No |