Taking over an existing restaurant is like buying a used car. Sure, the car might look good, and the engine might not make any funny sounds. But how that car handles the road really depends on the driver.

Behind the wheel at the Red Dog Cafe (8301-A Grubb St) is Kirsten Poole, of Kirsten’s Cafe in Montgomery Hills. Poole bought the Red Dog this summer and, according to Zagat.com, has no plans of futzing with the menu or decor.

That’s mostly a good thing. The menu sets up some creative premises, and the bright dining area is cheerful but not raucous. The seasonal patio adjacent to the parking lot is perfect for idly watching shoppers stroll in and out of the Silver Spring Food Co-op.

With aesthetics established, Poole now has the opportunity to work on how the Red Dog engine runs. Goodness knows the kitchen and wait service could use a collective tune-up. As mentioned, the menu has some interesting premises that rev on paper. But through some failure in execution, the meals limp across the plate.

For example, the hearty greens with “pulled” braised duck ($13, below) drops shredded duck and bacon bits onto a pile of mixed greens. The whole thing is backed up with roasted grapes and a port vinaigrette.

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The duck is straight out of the icebox, an act that tragically mutes its usually rich, robust flavor. Contrast that with the large bacon bits, crisp and still warm from the pan. The greens — romaine lettuce, feathery frisee, bitter arugula and peppery watercress — arrive at room temperature, as do the grapes and vinaigrette.

The wide temperature range makes it extremely difficult to appreciate the salad’s complexity. The sweet port vinaigrette is also ladled on, thus drowning the contrasting flavors. It’s a creative, even brilliant premise that falls flat on execution.

The pulled pork ripieghi — shredded barbecued pork folded into a pita-like bread ($12, not pictured) — has road blocks of its own. The pork itself is slightly dry but not stringy, and is seasoned with sharp cumin. When combined with the optional Pommary mustard sauce, the result is a lively, tangy combination.

However, during one visit, the optional Piedmont-style barbecue sauce was unavailable. (The cafe’s baby back ribs run on the same sauce.) According to the server, the barbecue sauce had been nixed after customers complained that it was too salty.

All of the ripieghi sandwiches come with one side dish of choice. The baked macaroni and cheese is pleasantly buttery and ooey gooey (though the macaroni is technically ziti, and Parmigiano and mozzarella substitute traditional cheddar). The herb-roasted potato wedges are plump and also hit nicely with butter.

Red Dog’s crab cakes — offered one night as an entree ($17, below), another night as an appetizer — aren’t cohesive enough to be considered cakes. Instead, they come off as dollops of warmed crab salad with too many bits of sweet green and yellow bell pepper.

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When served as an entree, the crab cakes sit on pillows of mashed potatoes. The accompanying cole slaw is overpowered by bitter parsley and nearly outshouts the crab cakes’ sweetness.

The cafe’s menu also offers a selection of pizzas, with one presenting an interesting health challenge. The pepperoni and Italian sausage pie ($15, not pictured) celebrates gluttony with salty pepperoni and a layer of sweet anise-seasoned sausage. Silvers of red onion add a little crunch, and a dense layer of mozzarella puts the pie over the top.

The health challenge is this: The pie, which is short on tomato sauce, gets its moisture from the pool of sausage grease in which it steeps. Is it a tasty pizza? Yes. Can it take decades off one’s life expectancy? Probably.

There are gremlins in the kitchen, but it’s the wait staff that could use a swift kick in the ass. They’re painfully slow at delivering dishes and bills, yet strangely quick when it comes to offering the dessert menu or a to-go box. Offers for coffee and a doggie bag shouldn’t come half way through the meal.

Owner Kirsten Poole has work to do with this operation. At least she can be assured that the Red Dog Cafe is no lemon.

Red Dog Cafe, 8301-A Grubb St, (301) 588-6300.