Background: Limited information is available for dogs on threshold concentrations (TCs), and the protein composition of common allergenic extracts produced by different manufacturers.
Hypothesis/objectives: To characterize the protein heterogeneity of tree, grass, weed and mite allergens from different lots of allergenic extracts, and to determine intradermal TCs for healthy dogs using extracts from two manufacturers.
Animals: Twenty five privately owned, clinically healthy dogs and ten purpose-bred beagle dogs.