When to Put Down a Dog with Diabetes + Average Lifespan Expectancy

When to Put Down a Dog With Diabetes

Important Note: This article has been checked and verified by a professional veterinarian for accuracy. However, you should always seek advice from your own vet before making any decisions on euthanasia as there are never black and white answers for this decision.

It can be really hard knowing your dog has a disease, especially if, like canine diabetes, it doesn’t have a cure. You will also have to consider when you might need to put your dog down, and what their life expectancy will be.

However, a common misconception about diabetes in dogs is that it is pretty much a death sentence, and that dogs should be put to sleep at the moment of diagnosis. This isn’t the case, as diabetes can be managed successfully a lot of the time.

When to put your dog down with diabetes? Unless your dog is very old or has other health complications related to their diagnosis, it might not be necessary to put them down. Consult with your vet about their life expectancy, any health issues, and outlook before making a decision.

You can read more about making a decision below. There is also detail on signs your dog with diabetes is dying, and when that decision might need to be made quicker.

The average lifespan of a dog with diabetes 

What is the average lifespan of a dog with diabetes? If your dog lives past the first few months of being diagnosed, and aren’t left untreated, then their median survival time is another 2 years. But, be aware, that’s the average, not what they could have. They could potentially have another 5/6/7/8+ happy years of their life.

This information on median survival time being 2 years is referenced from this study of 180,000 insured dogs. But, as the subset of dogs were only insured, it might not be truly representative.

Many dogs with diabetes won’t actually die of diabetes, but each dog will need to be assessed on a case by case basis.

In fact, many dogs with diabetes have completely normal lifespans and a high quality of life provided they have the correct treatment.

When my grandmother’s dog first got diagnosed with diabetes, it was a lot to take in, particularly as we also had to consider if it was kinder or not to put him to sleep in light of his diagnosis.

If you’re wondering whether or not the time is right to put your dog with diabetes to sleep, this article will give you a personal overview of canine diabetes, treatment options and what you might have to do in the future – all based on our family’s personal experience of my grandmother’s diabetic dog’s lifespan after diagnosis.

What is canine diabetes?

If a dog is diagnosed with canine diabetes, this means that their pancreas doesn’t produce an adequate amount of the hormone insulin (if at all). Alternatively, their body might not react to insulin in the correct way.

Insulin controls the ability of glucose to be absorbed from the blood into the cells of the body to be used for energy. But without working insulin, the glucose stays in the bloodstream, leading to high blood sugar levels. As a result, the dog’s body starts metabolising fat to create ketones which are a more accessible source of energy which insulin isn’t needed for, but high levels of ketones in the body will make the dog feel very unwell.

If there isn’t enough insulin in your dog’s body or it isn’t working in the right way, this means that there is no way of controlling the level of sugar in your dog’s blood, which can lead to a condition called hyperglycaemia (see the PetMD.com definition).

Hyperglycaemia can make dogs seriously ill after a while, especially if they’re in conjunction with other health issues like urine infections. Diabetic dogs are more prone to other health issues, and also have a 70% chance of going blind due to cataracts.

There are two types of canine diabetes: insulin-deficient diabetes and insulin-resistant diabetes (also known as known as type 1 and type 2).

1. Insulin-deficient diabetes

If your dog has insulin-deficient diabetes (also known as type 1 diabetes), this means your dog is unable to produce enough or, indeed, any insulin at all.

This usually happens when the pancreas is damaged or unable to function properly.

This is a life-long condition, and means that your dog will need to depend on insulin treatments to ensure their body is managing sugar properly.

Insulin-deficient diabetes is the most common type of diabetes for dogs. 

2. Insulin-resistant diabetes

If your dog has insulin-resistant diabetes (also known as type 2 diabetes), this means that whilst your dog’s pancreas is still producing some insulin, it isn’t being processed by the body in the correct way.

Although this isn’t as common as type 1 diabetes, it can occur in overweight, older dogs. Furthermore, female dogs who are pregnant can also develop a temporary insulin resistance.

Symptoms of diabetes in dogs

Although diabetes may present itself differently depending on the dog, there are some common and symptoms you can look out for:

  • Increased urination – this happens because glucose is drawing water with it into the urine.
  • Excessive thirst – this is the body’s way for compensating for unexpected fluid loss.
  • Weight loss – because the glucose isn’t able to be absorbed into the cells. Therefore there is an excess amount of glucose in the blood, which is higher than the kidney’s filtration threshold’s, and as a result, the excess spills over into the urine.
  • Increased appetite
  • Change in how their breath smells – ‘Sweet smelling’ breath
  • Urinary tract infection – due to high levels of glucose in the urine makes it a great place for bacteria to grow.
  • Loss of sight – another side effect of diabetes is cataracts (a clouding of the lens in the eye), which can lead to blindness. If you notice your dog’s eye looking cloudy or it seems as if he’s lost his sight, it is likely this is a result of diabetes.

To diagnose your dog with diabetes, the vet will perform a blood and urine test to look for elevated levels of glucose, electrolyte imbalances and high liver enzymes.

Your vet will also help keep an eye on signs your dog with diabetes is dying to help the decision over euthanasia be made.

What causes canine diabetes?

Although there are no certain causes for canine diabetes, some factors make it more likely. These factors include:

  • Gender – un-spayed female dogs are most likely to get diabetes.
  • Age – middle-aged to senior dogs are more prone to the disease.
  • Pancreatitis – having this illness (inflammation of the pancreas) in the past might cause long-term damage to the pancreas which impacts the production insulin.
  • Weight – a factor in insulin resistance is obesity.
  • Genetics – some research suggests genetics is a factor: if you got your dog from a breeder, check your Kennel Club paperwork.

However, even if none of these causes apply to your dog, you shouldn’t rule out diabetes if they exhibit some of the symptoms.

Diabetes treatment for dogs

Specialised diet and exercise plans will be recommended with your vet as part of treatment in order to prevent sudden spikes or falls in glucose.

You will also be shown how to monitor your dog’s blood sugar. This will be done by urine tests or a pinprick blood test.

Your vet will also determine an insulin type and dose for you to treat your dog with at home – usually via injections. Most dogs require insulin injections twice a day, around twelve hours apart after eating.

Handy Hint: You should always make sure that your pet insurance policy cover diabetes, because no policies will pay out on a pre-existing condition.

When is it time to put a diabetic dog down?

However, if your dog has been diagnosed with quite an advanced stage of diabetes, the kindest thing to do may be to put them to sleep. But when is the right time to put a diabetic dog down?

Just talk with your vet…

You will be advised by your vet about the best course of action, but it is ultimately your choice. A lot of first-time owners, however, regret keeping their pet alive and suffering longer than they needed to.

It can be very hard to let go of your best friend, but you’ll need to consider whether they are living the best quality of life.

Diabetes in its advanced stages can lead to a plethora of other health issues including:

  • Kidney failure
  • Seizures
  • Urinary tract infections
  • Blindness
  • Ketoacidosis


Although canine diabetes doesn’t need to be life-threatening, the gravity of the disease shouldn’t be diminished.

Early diagnosis is key if you want to avoid putting your dog to sleep, but if your dog is already dealing with advanced diabetes, it is likely they have other underlying health issues that severely detriment their quality in life where, in which case, putting them to sleep might be the best course of action for them.

Disclaimer: I am not a vet. All of the advice in this article is based on personal family experience and discussions we had with the vet.

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Marc Aaron

I write about the things we've learned about owning dogs, the adventures we have, and any advice and tips we've picked up along the way.

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