DENVER -- Colorado Humane Society officials said they have closed their animal clinic in Lakewood, laid off veterinarians and workers amid reports of violations regarding the care of animals at its facilities.

Over six weeks, 7NEWS discovered 13 dead animals in the Dumpster outside the Colorado Humane Society on South Platte River Drive.

Through testing, sources, and identification, 7NEWS confirmed at least six of those animals had been euthanized.

Arapahoe County announced Wednesday they were ending their contract with the animal care group, citing violations that include disposing of euthanized animals in a Dumpster. The county paid the Humane Society $4,125 a month to house and care for stray animals, dispose and cremate deceased animals, and hold animals involved in bites.

The Colorado Humane Society has now admitted to improperly disposing of two of the 13 animals discovered by 7NEWS. However, that admission came after the executive director, Mary Warren, had denied everything.

Warren insisted she knew nothing of the improper disposal of animals.

Current and former employees of the Colorado Humane Society told 7NEWS they were ordered by Warren to put dead animals in the Dumpster.

Bob Warren, director of development for the Colorado Humane Society said that former employees were giving the group a bad reputation and he praised dedicated volunteers.

"We spend more to have our animals cremated than anybody else in town," Warren said.

Cash donations have dropped 80 percent since the allegations recently surfaced, he said.

"We operate on about $1 million a year. That seems like a lot, but we save 92 percent of the animals that come here," he said.

Some of the allegations were investigated by the Tri-County Health Department and the Colorado Department of Agriculture Division of Animal Industry.

The Colorado Attorney General's Office also issued a subpoena for records of the non-profit, 7NEWS reported.