I know there are a bunch of answers to this question “over yonder” and thought I’d ask here instead. The more exhaustive the checklist, the better.
Edited to add: I am likely getting a medium breed, possibly a smaller breed. I am asking for a checklist of things to purchase ahead of time, and not tips (though I thank those who did offer tips). This would be things like a crate, food/water bowls, etc
Veterinarian here and my answer would depend on your housing situation and the breed of dog you’re getting. Like if you’re getting a small toy breed and you live in an apartment maybe get some pee pads ready and start brushing teeth as young as possible…
Most universal recommendations would probably be small dehydrated liver bits for training in a tightly sealed bag you take with you wherever you go. Almost everything else can be situational. For difficult large breeds with prey drive that live on property I see a lot of success with e-collars / training collars instead of a leash. Don’t want your pet to think every chance off a leash is a chance to escape and be free.
I added a comment that addresses the housing situation and sort of answers the breed question. Thanks for your response!