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Bloody diarrhoea in dogs: when it’s an emergency

by | Apr 21, 2026 | Latest Monthly Newsletters, Pet Care

You may not have heard of AHDS (Acute Haemorrhagic Diarrhoea Syndrome) in dogs, but you may be a little more familiar with its previous name of HGE (Haemorrhagic Gastroenteritis)!

Here’s more about AHDS, and why dogs affected with this condition should receive prompt veterinary treatment.

What is AHDS?

AHDS in dogs involves sudden and severe gut upset that causes affected dogs to pass bloody diarrhoea (which can range from pink and pasty to almost strawberry jam-like) and often vomit too. These poor pets rapidly lose body fluid and protein via their gastrointestinal tract, and can develop potentially life-threatening dehydration and low blood pressure.

What causes AHDS?

The exact trigger for AHDS isn’t always clear, with potential causes including the pet eating something irritating or toxic, stress, or infections (i.e. a “tummy bug”).

It tends to be more common in small breeds such as Maltese, Poodles, Mini Schnauzers and Yorkshire terriers.

Can I treat my pet at home?

Healthy adult pets with mild vomiting and diarrhoea (1-2 bouts per 24 hours, with no obvious blood present) who are still acting bright and energetic can be monitored at home. After 6–12 hours of fasting, they can be offered small, bland meals with a low-fat protein such as skinless cooked chicken, spring water tuna or low-fat cottage cheese, plus a gentle carbohydrate such as boiled rice or sweet potato.

However, pets showing any of the following symptoms should be assessed by a vet promptly, as they will likely need further supportive care:

  • Very bloody or profuse diarrhoea
  • More than two vomits in a 24-hour period
  • Appearing lethargic or in obvious pain
  • Not able to hold down water

Young puppies or older dogs with known health issues should also be checked promptly, as they can be more rapidly affected by dehydration and low blood sugar.

For more information on gastrointestinal care in pets, consult our tummy-terrific team!