Not only do elevated dog beds benefit large dogs, but they also older dogs and those with mobility issues (e.g., arthritis and hip dysplasia) by lightening the pressure on their legs.
Borborygmus is the sound your stomach makes when you are hungry.
This sound is due to the movement of fluids and gasses inside the intestines. This is a normal phenomenon that anyone experiences. If you are not hungry, this could be a sign of incomplete digestion.