Liver Shunts in Shetland Sheepdogs

The liver is the body's filter. When blood skips it, toxins from digestion reach the brain, and the resulting picture is called hepatic encephalopathy. Because it is driven by digestion, the signs wax and wane with feeding.

Suspicion usually arises from routine bloodwork in a poorly grown puppy: low urea, low protein, small red blood cells, mildly raised liver values. The specific test is a paired bile acid measurement, taken fasted and then two hours after a meal, which reveals whether the liver is extracting what it should. An ammonia level can support the picture.

Confirming where the shunt is, and whether it is a single vessel outside the liver or a network inside it, needs imaging. Ultrasound in experienced hands, then a CT angiogram in most referral settings. That imaging requires general anaesthesia, and here two problems compound each other in a Shetland Sheepdog.

A dog with a shunt already clears drugs poorly, because the liver is the organ doing the clearing. On top of that, MDR1 drug sensitivity is documented in this breed, which independently changes how certain agents behave. An anaesthetist facing both needs to know about both, and the genotype should be tested and recorded before the dog is booked in.

Treatment is medical first, with a specific diet and medication to reduce the production and absorption of gut toxins, and then surgical in suitable cases, where the shunting vessel is gradually closed off so blood is redirected through the liver. Single vessels outside the liver have the best surgical outlook. Networks inside the liver are usually managed medically for life.

If you think your Shetland has liver shunts, the plan is three steps: write down what you have seen and when it started, book a veterinary appointment rather than waiting for the next flare, and take video of the behaviour or symptom before you go — the thing you are worried about rarely happens in the consulting room. Screening in the parents covers collie eye anomaly, mdr1 drug sensitivity, dermatomyositis.

What the vet visit should produce is a diagnosis and a written plan, not just reassurance: what is being ruled out, what the monitoring interval is, and which signs mean you come back sooner. Ask what the treatment costs across a year rather than per visit, because that is the number that decides whether you are managing this condition or reacting to it.

Between appointments, keep a short log — dates, what you saw, what changed. It is the single most useful thing an owner brings to a follow-up, and for liver shunts it is often what separates a clear pattern from a guess.