If you call around, you'll find most board-and-train programs land in the same price range. That makes price a poor way to choose. What actually differs is how the weeks are spent and what you're handed back at the end. Here's what I'd ask, in the order I'd ask it.
How many dogs are there at once?
This one tells you more than anything else. A program running twenty dogs at a time is running a schedule, not a plan. Your dog's training is whatever fits between everyone else's.
Ask for the number, ask how many handlers, and do the division yourself. If the answer is vague, that's the answer.
Where do the dogs sleep?
There's a real difference between living inside a home and a concrete run. Dogs that spend their day around normal household activity are learning something all day — how to settle when nothing is happening, how to be near people without coming apart. Dogs in runs are waiting between sessions.
The hours a dog isn't training still teach him something. It's worth knowing what.
Ask to see where they sleep. Anyone who won't show you has already told you.
How many sessions a day?
Two long sessions is not the same as five short ones. Dogs learn better in short reps, ended while they're still winning, spread across the day. Ask for the count and the length. Ask what a session actually looks like on day three versus day seventeen.
Then ask what happens when a dog isn't progressing — whether the plan changes, and who decides.
Does the handover train you?
This is where most programs quietly fall short, and where the money is either well spent or wasted. Your dog comes home fluent in a system you've never used. If nobody teaches you the system, he'll drift back inside a month and you'll assume the training didn't hold.
Ask what the handover includes: how long it is, whether it's hands-on, and what happens afterward if something slides. A program confident in its work will have a real answer, because the follow-up is cheaper than the reputation.
None of these questions are hostile, and any trainer worth hiring will be glad you asked them. You're not testing them. You're finding out whether what they do fits the dog you actually have.