Continuous Grazing Is Not Optional for a Guinea Pig
Guinea pigs are designed to eat hay for long stretches of every day, and that constant fibre keeps the gut moving and the teeth wearing down. When a guinea pig stops eating, the gut slows, gas and discomfort build, and appetite falls further, so today is already the day to act rather than a problem to revisit tomorrow. The empty hay rack is the headline; your job is to gather the clues that tell the vet why it is empty.
Behaviour gives the first read. A guinea pig who stays in her hide, does not wheek or shuffle forward when the greens bag rustles, sits fluffed, or grinds her teeth quietly is very different from one who is bright but unimpressed by a new hay batch. Both matter, but only one can wait for a routine appointment slot, and even a bright pig who has eaten nothing needs a same-day call.
Teeth and Vitamin C: The Two Guinea-Pig Specialists' Causes
Dental trouble tops the list because guinea pig teeth, including the back molars you cannot see, grow throughout life. Uneven wear creates spurs that cut the tongue or cheek, and a pig may then approach hay eagerly, take a strand, chew slowly, and drop it. Watch for exactly that pattern, plus drooling, wet fur under the chin, selective eating where soft veg goes down but hay does not, and gradual weight loss that you feel as a more prominent spine.
Vitamin C is the cause owners forget because it hides in the routine. Guinea pigs cannot make their own vitamin C, and a diet relying on old pellets and low-C greens can leave a pig with sore joints, a rough coat, reluctance to move, and a mouth too uncomfortable for hay. Ask yourself honestly what she has actually eaten over recent weeks, not what was offered, especially if she sorts a mixed food and leaves pieces behind.
Droppings, Weight, and the Veg-Time Test
Count droppings and look at their size. A grazing guinea pig produces them constantly; droppings that shrink, taper, or nearly stop confirm the gut is slowing and raise the urgency. A swollen, tense, or drum-tight belly, or a pig who cries when picked up, needs emergency advice rather than home observation.
Offer her most familiar green right at her hide entrance and watch without lifting her out. Taking soft food but refusing all hay points toward chewing pain or a gut already uncomfortable with fibre; refusing everything, including a food she normally grabs, points toward a pig who feels properly unwell. Check the water bottle too, because a stuck ball bearing can leave a pig too dry and uncomfortable to eat, and offer a bowl as backup while you arrange the vet visit.
Keep her warm, in her normal enclosure with her companion if they are settled together, and keep hay within a step of where she is sitting. Do not separate her for hours of monitoring if the separation itself stops her eating, and do not syringe feed a pig whose belly is bloated or who has not been examined.
Book Today and Bring a Guinea-Pig Timeline
Any guinea pig who has eaten nothing today, whose droppings have dwindled, who drools, or who sits hunched and quiet should be seen today; breathing difficulty, a bloated abdomen, collapse, or crying in pain is an emergency. At the clinic, a proper molar examination and questions about hay, greens, pellets, and vitamin C sources are the expected core of the workup.
Arrive able to answer those questions precisely: hay type and how much disappears daily, the greens rotation, pellet brand style and amount, and her last known weight. With that feeding history and weight trend held in KinsLe's Pet Passport, the vet can judge whether today's silence at the hay rack began with teeth, diet, or a slowing gut without losing time to guesswork.