You will know what genuinely has to be ready on day one, and which spending makes more sense once the animal is there.
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Getting ready for an arrival usually means filling an online basket. Part of that basket gets replaced within the month, because it was bought without knowing the animal.
Before you know the animal, you know neither where it will sleep nor how it sleeps. Curled up, stretched out, against a raised edge, up high, on the tiles in summer: those preferences decide the shape and the size.
A folded blanket, and a cardboard box for a cat, covers the first week perfectly well. Some animals ignore the new bed anyway and pick the box.
Bought afterwards it costs the same and lasts longer. That is the only advantage of waiting, and it is enough.
The sizes on the packaging are based on averages. Two dogs of the same weight do not have the same neck, and a growing cat changes within weeks.
The fit is checked on the animal: two fingers should slide between the strap and the neck. Too loose and it slips out; too tight and it rubs.
If a collar or harness has to be there on day one, buy an adjustable one and accept that it is temporary. The right model gets bought once you have real measurements.
A ceramic kitchen bowl, stable and washable, does the job. What matters is that it does not slide and that it sits low enough for the animal.
Raised bowls, slow feeders and dispensers answer specific problems. You do not yet know whether your animal has any of them.
Buy them when the problem shows up. Buying first means buying a solution to a question that may never be asked.
A cat that ignores the ball can spend an hour on a bottle cap. A dog that leaves the plush toy alone may only play tug. None of it can be guessed.
Get one or two of different kinds, watch, then add. The pack of ten usually ends up as two toys in use.
What to check is anything that comes off: strings, stitched eyes, small parts. That is the only criterion worth attention before you know its tastes.
Diffusers, calming collars, food supplements: these often get bought before the arrival, for stress that has not happened yet.
If stress does appear, a vet is the one who says what is justified, what does nothing in this particular case, and what interacts with any current treatment. That conversation cannot be replaced by a shelf.
Buying ahead also has a side effect: it makes you feel the question is handled, and it delays the one thing that always helps, slowing down.
A carrier or travel crate suited to the journey. Water and a stable container. The exact food it was getting before, enough for a few days.
For a cat: a tray, litter of the same type it already knew, and somewhere to hide. For a dog: an adjustable collar or harness, a lead, and up-to-date identification.
The rest can arrive during the week. Nothing on this list is replaced by a pricier product, and nothing pricier replaces what is missing.