Monitoring a diabetic dog with FreeStyle Libre: glucose data in clinical context

Put glucose data in clinical context

FreeStyle Libre monitors interstitial glucose across multiple days, helping reveal glucose patterns that a single measurement cannot show. [1] [2]

A diabetic dog’s monitoring plan includes clinical signs and body weight alongside blood glucose curves, continuous glucose monitoring or fructosamine measurements as needed. Interpret glucose results in that clinical context; different monitoring methods may disagree. [3]

A retrospective study found that Libre-derived measures, including time in range, time above range, mean glucose and glucose variability, may help assess control in diabetic dogs. These measures complement clinical assessment, and standardized veterinary interpretation still needs further study. [2]

Choose an appropriate monitoring method

A home blood glucose curve may be an option when glucose measurements are needed, but the owner must be able to collect samples and the dog must tolerate the process. Use a veterinary-calibrated blood glucose meter. The insulin formulation also matters: the AAHA guideline favors continuous monitoring for dogs receiving basal insulin because assessment over more than one day is needed. [1]

Confirm low Libre readings with a veterinary-calibrated blood glucose meter before changing therapy; this is especially important when the dog has no clinical signs of hypoglycemia. Very high or low Libre readings often warrant confirmation. [1]

Make owner instructions explicit

Give owners written instructions about what to watch for, how to respond to changes in their dog’s condition and how to obtain help from the veterinary team. Those instructions should include recognizing and responding to suspected hypoglycemia. [4]

Owners should recognize signs of hypoglycemia, including lethargy, sleepiness, strange behavior, abnormal gait, weakness, tremors, collapse and seizures, and have written instructions for responding. The AAHA guideline advises feeding a conscious dog with mild signs a small high-carbohydrate meal and then taking the dog to a veterinarian. For moderate-to-severe signs, poor responsiveness or tremors, corn syrup is rubbed on the gums without the owner putting fingers in the dog’s mouth, with the owner aware of the risk of aspiration, and the dog is taken to a veterinarian. A dog having seizures receives the same corn syrup step, applied without putting fingers in the dog’s mouth and with the owner aware of the aspiration risk, and needs immediate veterinary attention. [4]

Owners may decrease or skip an insulin dose if clinical hypoglycemia is noted or confirmed on a veterinary-calibrated meter, but should never increase the dose or frequency without instructions from their veterinarian. The guideline also advises considering a dose reduction when a dog shows clinical signs of hypoglycemia or has prolonged subclinical hypoglycemia, defined as blood glucose below 60 mg/dL for 1 to 2 hours. [4] [1]