How To Tell If Your Dog Is Sick

2. No appetite

It’s not unheard of for a dog to skip a meal once in a while. Just like humans, sometimes dogs just don’t feel like eating for any number of reasons. However, you do need to pay attention when your dog refuses to eat anything for 24 hours because that can be an indication of something serious. At times, too much stress can cause a dog to stop eating as well as when they have a fever or when they are in pain. Get your dog to the vet if he or she shows a lack of interest in eating for an entire day.