Vaccines may cause side effects, but they are mild in most cases. Most reactions are an indication that your pet’s immune system is reacting correctly to the vaccine. Your pet may experience an elevated temperature, have a decreased appetite, or be a bit sluggish for a day or two after the vaccination. In addition, you may note a slight swelling or pain at the vaccination site. These are all normal reactions and do not require medical attention.
Rarely however, more severe reactions may occur that can result in swelling in the face or limbs, generalized itching, difficulty breathing, a temperature of 104.5 or higher, vomiting, diarrhea, or collapse. If any of these more serious signs develop or you are concerned about any reaction in your pet, don’t hesitate to contact a veterinary hospital immediately.