By Paul Ziobro 

Dollar General Corp. on Thursday said it faced higher hurdles from antitrust regulators in Washington than anticipated in its pursuit to acquire Family Dollar Stores Inc.

Analysts said the company's statement effectively conceded defeat in the seven monthlong fight between the country's three dollar-store companies.

The discount retailer criticized the Federal Trade Commission, alleging the agency used a controversial model to review its all-cash $9.1 billion bid to buy Family Dollar, whose shareholders are due to vote next week on whether to accept Dollar Tree Inc.'s rival cash-and-stock bid worth $8.7 billion.

An FTC spokeswoman declined to comment

Despite the ticking clock, Dollar General didn't indicate whether it would increase its bid and said it would need more time to get its offer through regulators.

Momentum appears now to be behind Dollar Tree's bid, which on Wednesday garnered support from proxy advisers Institutional Shareholder Services and Glass Lewis & Co.

Earlier this week, Dollar Tree said it was running low on patience and signaled it might pull its offer if next week's vote didn't go ahead.

"We consider a potential [Dollar General-Family Dollar] tie-up to be dead," analysts at FBR & Co. wrote in a note to investors. "At this point we think a [Dollar Tree-Family Dollar] combination is a done deal."

In previously rejecting Dollar General's offer, Family Dollar had argued the bid would face strong regulatory resistance because fortifying the nation's biggest dollar-store company could hurt price competition among retailers at the lowest end of the household-goods market.

In contrast, a combination of No. 2-ranked Family Dollar and No. 3 Dollar Tree could be more palatable to regulators because it would create a bigger rival to compete against No. 1 Dollar General and other bigger discount chains, such as Wal-Mart Stores Inc.

In addition, Dollar General and Family Dollar have more-similar business models, with both selling household merchandise at a range of prices, while the smaller Dollar Tree sells everything at a dollar.

Growth of online competition in recent years has helped allay concerns from federal antitrust regulators that consolidation in the retail sector would lead to higher prices for consumers. But Family Dollar said its antitrust discussions included evidence that Dollar General was a big factor in determining its prices. Among the findings: prices at far more than 1,500 Family Dollar stores are set solely on whether a Dollar General is nearby.

But Dollar General has maintained it would be able to clear antitrust hurdles and wouldn't need to divest more than the 1,500 of its stores it had been willing to shed to get the deal done.

It appears Dollar General's conviction that its bid would clear regulators was thrown for a loop by the FTC's methodology to evaluate the pricing impact of consolidation. "The FTC has departed from the approach used to analyze retail mergers over recent years and has instead relied heavily on an untested theoretical model for predicting circumstances in which pricing will increase," Dollar General said. "The use of this model as a predictor of the likelihood of price increases is controversial."

The company said it believed it would be able to keep the store divestitures below 1,500, especially if Family Dollar were to become "an ally" in the discussions with regulators.

Still, Dollar General said its engagement with the FTC is continuing but that it wouldn't be able to comply with an additional step in the FTC's request for information until Feb. 10, which is well after the Jan. 22 Family-Dollar shareholder vote on the Dollar Tree offer.

Antitrust lawyer Michael Keeley of Axinn, Veltrop & Harkrider LLP said Dollar General has been boxed into a corner because the FTC can effectively veto a hostile bid that raises potential antitrust issues without needing to file a legal challenge. "Dollar General can't move to close the deal because its bid is hostile and shareholders think there is [an] FTC risk," Mr. Keeley said.

-Brent Kendall and Michael Calia contributed to this article.

Write to Michael Calia at michael.calia@wsj.com

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