It seems like Akira has seasonal allergies and dust allergies in addition to her food allergies. Because I really don't want to give her long term steroids, I decided to only give her the 1/4 tablet of Zyrtec that the vet told me to give her before. I try to wait 'til I just have to give it to her, because I know that people can build up a tolerance to antihistamines, so I figure that animals can, too.