There’s little or no evidence to suggest that dogs get Type 2 diabetes, although cats can. Dogs can and do develop Type 1 diabetes. Just like in human beings, this form of the condition is marked by a lack of insulin, the hormone that keeps blood sugar in check.
When an animal or human has diabetes, their muscles have trouble converting glucose into energy. An excess of glucose builds up in the blood, causing a state of hyperglycemia. If left untreated, this will develop into severe health problems