Can Puppy Shots Cause Them to Be Sleepy or Lethargic?

Yes. It's normal for puppies to be sleepy or lethargic after receiving their shots, as their body might respond by resting and focusing energy on building immunity rather than running around. They may also temporarily experience discomfort or pain at the injection site, contributing to their fatigue. Usually, this should subside within a day or so. However, if your puppy's lethargy lasts longer, or they show other concerning symptoms, it's wise to consult a veterinarian.