Learning Issues What are the effects of Prednisolone Sodium Succinate, Duragesic, Butorphanol, and Cephalozin. Are any adverse effects possible? What is Duragesic? What is the nutritional value of Big Red dog food? Is the dogÕs caloric intake exceeding its nutritional need? Is there any possible negative interaction (ie kicked by horse) between the dog and other animals in the household? What can cause swelling distal to the stifle? What causes swelling? What can cause instability of the tibia, upper femur? What can cause crepitus? What methods can be used to precisely localize the abnormalities?