Pick an allergen below to see which other foods commonly cross-react with it in dogs, and what the peer-reviewed veterinary literature says about each pairing. Reaction rates are case-series ranges — your vet's read on your individual dog's history is what matters for treatment decisions.
Cross-reacts with other legumes (peas, lentils, chickpeas).
Mechanism: Both Fabaceae (legume) family; some shared storage proteins (e.g., vicilin).
Owner note: Many "grain-free" foods substitute peas for grains — soy-allergic dogs may react to these. Read ingredient lists carefully.
Source: Veterinary dermatology consensus
Mechanism: Legume cross-reactivity via shared protein structures.
Owner note: Lentils are common in modern grain-free formulations. Worth flagging in elimination trials for soy-allergic dogs.
Source: Veterinary dermatology consensus
Mechanism: Shared legume storage proteins.
Owner note: Increasingly common in premium dog foods. Same caution as lentils.
Source: Veterinary dermatology consensus
Mechanism: Both Fabaceae but more genetically distant from soy than peas/lentils.
Owner note: Peanut is rarely a primary ingredient in dog food but appears in some treats and flavourings.
Source: Limited canine-specific data
Upload a photo of any pet food label and the free scanner flags soy and the proteins that commonly cross-react with it.
Try free scanThe cross-reactivity rates shown here are case-series figures synthesised from peer-reviewed veterinary dermatology literature. They are population averages — individual dogs can fall well outside the reported range. Vets typically use cross-reactivity data to guide which proteins to exclude during an elimination diet, not as a reason to avoid a protein the dog has tolerated for years without symptoms.
The strongest pairings (high overlap) are the ones to flag with your vet first. The lower-overlap pairings often produce the most successful "novel protein" substitutions — but always confirm the dog has not previously been exposed before starting a trial.
For the long-form context behind these decisions, see the complete elimination diet protocol and the novel-protein vs hydrolysed comparison.
Disclaimer: this tool is education for pet owners, not veterinary advice. Cross-reactivity rates vary by dog, population and methodology. Always confirm specific cross-reactivity decisions for your dog with your vet.