When dogs have high blood sugar, they will show a variety of symptoms. The most common symptoms include polydipsia, polyuria, lethargy, and poor mental performance. Because blood sugar levels are too high, dogs will feel thirsty and need to drink water frequently. At the same time, a large amount of glucose enters the kidneys and requires more water to be filtered for excretion, causing the dog to urinate frequently. In addition, dogs may feel an increase in appetite, but due to reduced insulin secretion, the body cannot fully utilize energy, and may eat more and less. Prolonged high blood sugar may also cause your dog to lose weight.

Some dogs may also experience other symptoms of discomfort, such as fever, vomiting, etc. when they have high blood sugar. If blood sugar is not controlled for a long time, it may damage the dog's organs and body functions, leading to more serious complications.