Buster the cat's owner finds him in pain and pulling himself by his front legs. With the help of some X-rays, it's up to Dr. Devon Boyd to determine Buster's issue. Through creative surgery, she may just be able to put the spring back in his step. Then, a young Italian greyhound named Chelsea comes to a follow-up appointment with cardiologist Dr. Regan Williams, who previously had discovered a heart murmur in Chelsea. A proper blood test, coupled with an ultrasound of the heart, could be key in finding out what's wrong. Later, puppy Hershey's baby teeth stubbornly aren't falling out, which lands him an appointment with Dr. Sharon French. A routine procedure becomes anything but as the dentist goes on the hunt for engrained root fragments.