Worried your pet is having a vaccine reaction?
What to expect after a vaccination appointment:
Was your pet vaccinated at Black Dog today? What to expect and when to ask for help:
Vaccines are essential for protecting your pet against serious infectious diseases. Just like in humans, it is common for pets to experience mild side effects as their immune system responds to the vaccine and builds protection.
What is Normal?
What is Normal?
Most pets will show some mild symptoms within the first 24-48 hours following their visit. You do not need to call the clinic if your pet is experiencing the following:
- Mild Lethargy: Your pet may be extra sleepy or less active than usual. Extra snuggles can help as long as they welcome the effort.
- Low-Grade Fever: A slight increase in body temperature is a normal part of the immune response. Keep in mind a normal temperature for a dog or cat is warmer than yours (which makes them great snugglers in our long southeast Minnesota winters). Their normal temperature can range from 100-102.5.
- Reduced Appetite: They may skip a meal or show less interest in treats.
- Local Tenderness: The injection site may be slightly sore or have a small, firm lump. This lump should gradually disappear over the next few weeks.
When to Monitor vs. When to Call
While most reactions are minor, it is important to know which symptoms require a professional eyes-on assessment.
| Symptoms to Monitor | Symptoms Requiring a Call |
| Slight decrease in energy | Repeated vomiting or diarrhea |
| Skipping one meal | Persistent "hives" or skin welts |
| Mild tenderness at the site | Swelling of the muzzle, face, or eyes |
| Sleeping more than usual | Difficulty breathing or gasping |
Veterinary Intervention: The "Red Flags"
If your pet experiences any of the following, please contact us immediately or head to the nearest emergency veterinary center. These symptoms can indicate a rare but serious allergic reaction (anaphylaxis):
- Facial Swelling: Pronounced puffiness around the eyes, muzzle, or ears.
- Respiratory Distress: Labored breathing, excessive panting, or wheezing.
- Severe Gastrointestinal Upset: Repeated vomiting or bloody diarrhea.
- Collapse or Extreme Weakness: Inability to stand or sudden disorientation.
Tip: Keep your pet quiet and comfortable for the first 24 hours after a vaccine. Avoid heavy exercise, long hikes, or stressful grooming appointments to allow their immune system to focus on the work at hand.
When to Monitor vs. When to Call
While most reactions are minor, it is important to know which symptoms require a professional eyes-on assessment.
