Agents who searched the Camp Bowie Animal Clinic in Fort Worth released details on what they found when they searched the clinic after an animal cruelty investigation began earlier this week.
Agents found "animal organs in jars" and "stacks of drugs, trash, laundry" as well as bugs throughout the clinic.
The veterinarian, Tierce, acknowledged that his clinic was unsanitary. His clinic declined to comment.
CNN -- Authorities raided a popular veterinary clinic in the DFW area on Tuesday after a family's shocking discovery that the pet they thought was euthanized was kept alive.
The Harris family took the veterinarian's advice to have their 4-year-old Leonberger, Sid, put down in October because of worsening health problems.
But then on April 21, a former employee of the veterinary clinic called the family and told them that Sid was alive.
"He was put in a cage. Wasn't properly treated. Wasn't getting treatment."
He's been accused of keeping the dog alive and using it for blood transfusions.
Animal Control removed two more dogs as evidence in the local and state investigations.
The well-respected, licensed vet since 1966, Dr. Tierce has a clean record, and many are shocked and coming to his defense.
One woman, however, came to the clinic to make sure that her dog had actually been euthanized in December.