Allergies tend to become evident and intensify over extended periods of time and can take years to develop.
Allergens, ingested, inhaled, or airborne, can be seasonal or non-seasonal, similar to allergies in humans.
Symptoms can include both dermatological and gastrointestinal signs[3] such as itchy skin, hair loss and excessive scratching.
Common food allergens in cats include beef, dairy, fish, eggs, and chicken.
[9] In commercially available versions of these diets, producers usually include one protein and one carbohydrate source, in an effort to minimize reactions to any foods.
[11] Studies suggest that commercial elimination diets may still react negatively with a cat, even if they are devoid of the target protein/other problematic foods.
[9][11] Some drawbacks to a homemade diet are the time needed to shop for the ingredients and the potential financial setback.
[9] However, homemade diets are a great way to determine which ingredient is causing the negative symptoms in the cat.
[14] Common examples of novel proteins are lamb, rabbit, venison, duck, elk, kangaroo, ostrich, emu, goose and goat.