MRSA Skin Infection: Signs & Symptoms. MRSA infections can appear as a small red bump, pimple, or boil. The area may be tender, swollen, or warm to the touch. Most of these infections are mild, but they can change, becoming deeper and more serious.
Vitamin B12 (Cobalamin) Deficiency. Both dogs and cats with exocrine pancreatic insufficiency (EPI) are at risk of developing a vitamin deficiency at some point. Vitamin B12 (cobalamin) deficiency is extremely common in cats with EPI, and is seen in more than half of dogs with the condition.
Ultimately most animals developed a system of two lungs and one heart (along with the rest of their organs) because that's what was needed to survive and thrive on Earth. People didn't develop two hearts or eight legs or wings because we didn't need them for survival. And we developed two lungs because we need them.