WASHINGTON — That fur trim on your jacket that you think is fake? Tell it to Fido.

An animal advocacy group says its investigation has turned up coats — some with designer labels, some at higher-end retailers — with fur from man's best friend. Some retailers were scrambling to pull the coats from shelves, take them off Web sites and even offer refunds to consumers.

The Humane Society of the United States said it purchased coats from reputable outlets, such as upscale Nordstrom, with designer labels — Andrew Marc and Tommy Hilfiger, for example — and found them trimmed with fur from domestic dogs, even though the fur was advertised as fake.

"It's an industrywide deception," said Kristin Leppert, the head of the Humane Society's anti-fur campaign.

The investigation began after the society got a tip from someone who bought a coat with trim labeled as faux fur that felt real. Leppert and her team began buying coats from popular retailers and then had the coats tested by mass spectrometry, which measures the mass and sequence of proteins.

Of the 25 coats tested, 24 were mislabeled or misadvertised, the society said.

Three coats — one from Tommy Hilfiger's ShopTommy.com Web site, one from Nordstrom .com and one from Andrew Marc's MARC New York line sold on Bluefly.com — used fur from domesticated dogs. The others had fur from raccoon dogs — a canine species native to Asia — or, in one case, wolves. The single "correctly" labeled coat was trimmed with coyote fur, but it was advertised as fake.

Most of the fur came from China.

In response to the Humane Society's investigation, Tommy Hilfiger stopped selling the fur-trimmed garment and said it was looking into the matter. "We were quite concerned to hear of this finding," said spokeswoman Wendi Kopsick.

Nordstrom called the 62 consumers who had purchased vests with dog fur trim to give them the opportunity to return the vests, "because we would never want to deceive our customers in any way," spokeswoman Brooke White said. She said Nordstrom no longer buys fur trim products from that vendor, which had marketed the vests as faux fur.

Charles Jayson, chief executive of Andrew Marc, disputed the Humane Society contention and insisted in a statement that all fur on his coats labeled as raccoon contains "only farm-bred raccoon fur from Finland, and our items labeled 'faux fur' are a 100 percent synthetic fabric."

Michael Markarian, executive vice president of the Humane Society, said his group had traded letters with Andrew Marc over the test results and that the Humane Society stands by its research.

"Our tests have clearly concluded that not only is this real animal fur, but it's fur from domestic dogs. The fact that they don't believe us is unfortunate but we have confidence in our testing results," Markarian said.

But overall, he said, the Humane Society is pleased with retailers' response. "We think that the corporations want to do the right thing and that they are being deceived just as much as the consumers are being deceived," Markarian said.

Importing of domestic dog and cat fur was outlawed in 2000. Intentionally importing and selling dog fur is a federal crime punishable by a $10,000 fine for each violation.

Raccoon dogs look like oversized, fluffy raccoons and aren't kept as pets. Importing their fur is not illegal, but activists argue they are still a type of dog.

"This is an animal that is routinely killed by stomping them, or beating them, or skinning them alive," Markarian said. Video produced by Swiss Animal Protection and posted on the Internet shows raccoon dogs clubbed or slammed on the ground and some writhing, gasping and blinking as they are skinned alive.

The discovery of domestic dog fur is the latest twist in the investigation that ensnared retail giants Macy's and J.C. Penney late last year. Both of those retailers were discovered selling coats with raccoon dog fur labeled as raccoon.

J.C. Penney initially removed the offending garments from its stores around Christmas — but eventually it had employees scratch out the 'raccoon' label with black marker and put the coats back on the shelves.

Macy's immediately pulled the items from its shelves.

Burlington Coat Factory pulled some coats with mislabeled fur from its shelves. Rap artist Sean "Diddy" Combs stopped producing and selling coats from his Sean John line that had raccoon dog fur, and rapper Jay-Z pulled coats with raccoon dog from his Rocawear label.

Mislabeling fur is a misdemeanor punishable by a $5,000 fine or a year in prison. Fur valued at less than $150 is not required to be labeled.

A bill introduced by Reps. Jim Moran, D-Va., and Mike Ferguson, R-N.J., would close that loophole by requiring labels on all fur regardless of its value. It also would ban fur from raccoon dogs.

"Americans don't want Lassie turned into a fur coat," Moran said.