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 goat and mutton; moderate beef overlap.
Mechanism: Both within Caprinae (sheep + goat); muscle proteins overlap heavily.
Owner note: Goat is rarely a safe alternative for lamb-allergic dogs. Vets typically use a different species entirely (fish, venison, duck).
Source: Veterinary dermatology consensus
Mechanism: Mutton is sheep meat from older animals. Same proteins as lamb.
Owner note: Treat mutton as identical to lamb in elimination trials.
Source: N/A (mutton is older sheep — same species)
Mechanism: Some shared mammalian protein epitopes between Bovidae members.
Owner note: A meaningful subset of lamb-allergic dogs also reacts to beef and vice versa. Vets typically rule out both during elimination work.
Source: Mueller et al., BMC Vet Res 2016
Upload a photo of any pet food label and the free scanner flags lamb 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.