No emergency dash is needed for a thriving pup, but an early appointment earns its keep. Book the first check in the opening weeks after birth, or within about a week of the pup arriving home if that comes sooner, so a practice has the youngster registered before any urgent need arises. That visit confirms the pup's sex with certainty, looks over teeth and skin, weighs the youngster, and sets a baseline for everything that follows. Pups arrive remarkably prepared — eyes open, furred, nibbling solids within days alongside nursing — and weaning happens at about three weeks, which is also the point by which young males must live apart from their mother and sisters, because they can breed strikingly early.
Sexing and the Three-Week Rule Are the Urgent Bits
If you take home one thing from the first visit, make it certainty about sex and a separation date in the calendar: brother-to-mother and brother-to-sister pregnancies happen in cages where 'they're only babies' was the plan. The vet will also show you what to track at home — weekly weighing is the guinea pig health tool, and a pup should gain steadily; a pup who is not gaining, is being pushed off food by cage mates, has crusty eyes or nose, sneezes persistently, has diarrhoea, or feels scurfy or itchy (mites and ringworm are common in young pigs) should be seen sooner than any routine date. Healthy pups need no vaccinations in most countries, so the first visit is about sexing, baselines, and your questions — bring a list, including diet, because vitamin C and hay advice at this age prevents a lot of later trouble.
Working With Your Vet
At a pup's first visit, your own observations are half the value. Note when you first saw anything that worried you — a pup not gaining, crusty eyes, persistent sneezing, loose droppings or flaky, itchy skin — and what else changed at the same time, then let the veterinarian examine, interpret and diagnose.
Written guidance can help you decide how quickly to book and what to watch between now and the appointment, but it cannot look inside an ear or listen to a chest — the weekly weights you bring, plus notes on appetite and behaviour and a phone video of anything episodic, give the vet evidence that memory alone cannot.
A baby guinea pig who is not eating or gaining, has diarrhoea, crusty eyes, laboured breathing, or is being bullied off food needs a vet promptly, not at a routine date.
Start the pup's log at that first visit: weekly weight, appetite, droppings and water intake, plus energy levels and any symptom together with the date it began. A gaining curve that flattens over two entries is visible on paper while it is still invisible in the cage, and the baseline deserves refreshing after weaning, a cage move, a new companion or any course of treatment.
Those early weights, sexing confirmation and diet notes are worth preserving from the start, and the Pet Passport in KinsLe holds this pup's packet together for every later visit, sitter or boarder.