Most of us are familiar with the common signs and symptoms associated with severe allergies. These include: tingling or itching in and around the mouth, swelling of the face, lips, tongue, and throat, wheezing, restricted breathing, abdominal pain, diarrhea, nausea or vomiting, dizziness, lightheadedness or even fainting. Being a seasoned vet, you know when to dial 9-1-1 when those types of allergic reactions occur.