If my dog has diarrhea, what steps should I take to alleviate their discomfort and ensure their swift recovery? Is it necessary to consult a veterinarian, or could this condition be managed with simple home remedies? Furthermore, how can I ascertain the severity of the situation? Should I be concerned about potential underlying health issues, such as dietary indiscretion or infections? What specific signs should I observe in my dog that would trigger an immediate trip to the veterinary clinic? In instances where the diarrhea persists, how can I differentiate between mild gastrointestinal upset and a more serious medical condition? Should I modify their diet temporarily, and if so, what types of food are advisable? Additionally, how can I prevent future occurrences of diarrhea in my dog? Are there particular foods to avoid or preventive measures that I can incorporate into their daily routine to maintain optimal digestive health?