Crickets and other insects are not known to cause allergic reactions in dogs. For most dogs, crickets are a novel protein that does not cause allergic reactions the way meat, legumes, and grains often do. In fact, crickets are far easier for dogs to digest than meat and plants. This means the protein in them is easily broken down and utilized by the body. When food is well-digested, it is much less likely the immune system will react to it.