Allergen-specific immunotherapy (ASIT) can be a useful tool in cats.
I see a number of cats that, following parasite elimination and control – plus no response to dietary trial – remain pruritic. We use serological testing via our commercial laboratory and then order in the ASIT vial(s) according to the results.
Although the efficacy of ASIT is by no means guaranteed, I find it generally works well in cats. In fact, I find the majority are controlled well, although it has to be said we see fewer cases than in dogs.