C3 Ulcers

Alpacas and llamas digest their food in a stomach divided into three compartments, called C1, C2 and C3. The first two ferment fibre, much like a cow's rumen. C3 is the last and narrowest section, and it is the part that produces acid and does the work a dog's or a human's stomach does. When the lining of that compartment breaks down, the raw, eroded areas left behind are what vets mean by C3 ulcers. Post-mortem work in alpacas has found ulceration turning up in C3 far more often than in C1 or C2, which is why the name is so specific.

These ulcers rarely appear in an otherwise thriving animal. In studied cases, affected camelids were usually seriously ill with something else, and the ulcers looked like a consequence of that primary disease rather than the starting point. Anything that suppresses appetite, causes pain, or piles on stress can tip the balance in C3, and pain relief from the non-steroidal anti-inflammatory group is a recognised risk factor across species. That makes C3 ulcers as much a warning sign as a diagnosis in their own right.

The hard part is spotting them. Signs described in llamas and alpacas run from mild to severe colic through to simply going off food, and both the clinical picture and blood results are often too vague to point anywhere in particular. Diagnosis in life is largely a process of exclusion, and in some animals the ulcers are only confirmed after death. Things worth reporting to your vet include:

• eating less, eating more slowly, or turning away from concentrates
• teeth grinding, or a hunched, tucked-up stance
• restlessness that looks like belly pain: repeatedly lying down and standing, rolling, kicking at the flank
• dullness, drifting away from the herd, or a drop in fleece quality
• gradual weight loss, or very dark, tarry droppings

None of these are specific to C3 ulcers, which is exactly why they deserve a proper examination rather than a wait-and-see week. A vet with camelid experience will look for the underlying illness alongside the ulcer, since treating one without the other tends to fail.

Camelids also do not respond to ulcer drugs the way people do. The older acid blockers cimetidine and ranitidine, familiar from human medicine, do not suppress acid production in C3 for long enough to be reliable in llamas and alpacas, while injectable proton pump inhibitors such as pantoprazole have been shown to raise the pH inside C3. Choice of drug, dose and route belong with your vet, and this entry is general background rather than a treatment plan. If you keep alpacas or llamas, the practical takeaway is to know your animals' normal appetite and demeanour well enough to notice when one quietly stops being itself.