Book the first exam for 48 to 72 hours after the cat arrives, not the same evening and not three weeks later. That window lets the cat decompress from transport, gives you something to report about appetite and litter box use, and still catches an incubating infection before it spreads through the house.
One visit covers four things: a full physical, the tests that the shelter could not run, a written vaccine and deworming plan, and a conversation about what to watch for in the next 14 days.
Why 48 to 72 hours and not day one
The first 24 hours after a move are the worst possible time to handle a cat for an exam. Cortisol is high, the cat has not eaten, and a normal physical on a terrified animal reads as abnormal. Two or three days lets you collect real information: how much it ate, whether it used the box, what the stool looks like. It also matters medically. Upper respiratory incubation runs roughly 2-10 days and ringworm lesions can take 1-3 weeks to appear, so a cat that looks clean at intake can be shedding by the time you sit in the exam room.
The exception is a kitten under 8 weeks, a cat with visible wounds, or any cat that has not eaten for 24 hours. Those go the same day.
What to bring to the appointment
Records decide how much of the visit is spent guessing. Ask the shelter or foster for the vaccine dates with product names, the deworming dates and drugs used, the FeLV and FIV test result with the date, and whether the cat was already sterilized. If the cat came from a hoarding case or a multi-cat foster, say so, because it changes the parasite and ringworm index of suspicion.
Bring a fresh stool sample, under 24 hours old, in a sealed bag, kept in the fridge rather than the freezer. Bring photos of anything you saw and cannot recreate: a soft stool, a sneeze with discharge, a patch of missing hair. Write down the food the cat was eating, with the brand, because a sudden switch on top of a move is the most common cause of the diarrhea you will be asked about.
What the physical actually checks
Weight to the gram on a kitten scale, and body condition scored 1-9, which is the number you will compare against at every future visit. Temperature at 38.1-39.2 Celsius. Gum color and capillary refill, since pale gums mean anemia and yellow means jaundice. Teeth, including a count of deciduous teeth to estimate age. Ears with an otoscope, because ear mites are common and invisible from outside. Skin under good light, with a Wood's lamp if there are scaly patches. Auscultation of heart and lungs, abdominal palpation for an enlarged bladder or a loaded colon, hydration by skin tent, and a gait check across the room.
The tests, and what each one misses
A fecal float plus a Giardia antigen test is standard, because shelter cats carry parasites at high rates and a single float misses intermittent shedding. FeLV and FIV are run as a point-of-care test; a kitten under 6 months can test positive from maternal antibody alone and must be retested at 6 months before any result is treated as final. Heartworm antigen testing depends on region and is worth asking about. A ringworm culture takes 10-14 days, so it is ordered on suspicion rather than as screening. Adult cats over 7 usually get baseline bloodwork and a urinalysis on the first visit.
The 7 to 14 day quarantine
Keep the new cat in one room with the door shut. Its own litter box, its own scoop, its own bowls, and its own bed. Feed and clean the resident cat first, then the new one, and wash hands between. Do not let them share a water bowl, a brush, or a blanket during this window. If ringworm is confirmed, extend to 21 days and add weekly vacuuming with a HEPA machine, since spores survive in hair and dust for over a year.
Quarantine is not cruelty. It is the only way to observe appetite, stool and urine output accurately, and it means a diagnosis in week one does not become three diagnoses in week three.
Meeting the resident cat in stages
Scent first, days 1-3: rub a cloth on each cat's cheek and put it in the other's room. Days 3-5, swap the cats between rooms for 30 minutes so each explores the other's territory while nobody is displaced. Days 5-7, feed them on opposite sides of a closed door, then a cracked door, 10-15 minutes at a time. Only then supervised meetings of 5-10 minutes, ending on a calm note rather than a fight.
Keep litter boxes at one per cat plus one, placed in different rooms, and add vertical space before you add cats to the same room. A first meeting that goes badly sets the relationship back 2-3 weeks; there is no prize for speed. The staged version of this is set out in introducing a new cat.
What sends you back before the follow-up
- No food for 24 hours, or no water for 12.
- Straining in the litter box with little or no urine: emergency, go now.
- Diarrhea lasting more than 48 hours, or any blood in stool.
- Sneezing with yellow or green discharge, or breathing with the mouth open.
- Yellow gums or skin, which means jaundice and possibly liver or blood disease.
- A wound, a limp, or a swelling that was not there yesterday.
First-week checklist
- Book the exam for day 2 or 3, and ask for a 30-minute slot.
- Collect the stool sample the morning of the visit.
- Photograph every record page, so the next clinic can be briefed in a minute.
- Set the quarantine room up before the cat arrives: box, water, hiding place, no open windows.
- Ask for the next vaccine date in writing, and put it in your calendar before you leave. The full sequence is in the feline vaccine schedule.
- Read the first 48 hours after adoption for the arrival side of the same week.
The first exam is cheap compared with what it prevents, and it is the appointment where you establish a baseline weight, a baseline temperament, and a vet who will take your call at 11 pm in two years.
Frequently asked
Can I skip the first vet visit if the shelter vaccinated the cat?
No, because a shelter record tells you what was given, not what the cat has. Vaccine timing matters more than the number of doses, maternal antibody can block a kitten series given too early, and the cat may be carrying parasites or an incubating virus that no vaccine covers. The visit is also where you register a baseline weight and get a written plan for boosters.
How long should a newly adopted cat stay in one room?
Seven to fourteen days for a healthy adult, extended to 21 if ringworm is confirmed or suspected. The point is not isolation for its own sake but a controlled window where you can measure food intake, stool and urine without interference. Kittens and cats from multi-cat settings often need the longer end of the range because of parasite load.
What if the cat hides and will not come out for the exam?
Do not chase it. Move the carrier into the room, leave it open with a worn t-shirt inside, and wait; most cats enter within an hour when the room is quiet and the lights are low. If the cat will not come out at all, wrap it in a towel and support the hind legs, or ask the clinic whether a home visit is possible for the first appointment.