The host of US TV show The Dog Whisperer, Cesar Millan, is being sued over an allegation that a pet Labrador was injured at his dog training centre.
TV producer Flody Suarez claims his pet Gator was suffocated by a choke collar and forced to run on a treadmill, resulting in bleeding and bruising.
Mr Suarez claims medical costs have already reached $25,000 (£13,500) and his dog requires further treatment.
Mr Millan's show has aired on the National Geographic Channel since 2004.
Mr Suarez is suing for breach of contract, fraud, animal cruelty and intentional infliction of emotional distress.
He is seeking more than $25,000 (£13,520) in damages.
Mr Suarez said he took his dog to the clinic in February to treat phobias of strangers and other dogs.
In court papers filed at the Los Angeles Superior Court, he claimed Gator was rushed to a vet an hour after dropping his five-year-old pet off at Cesar Millan's Dog Psychology Centre.
The dog was "bleeding from his mouth and nose, in an oxygen tent gasping for breath with severe bruising to his back inner thighs", the legal papers said.
Both the Dog Psychology Centre was not available to comment and a spokesman for the National Geographic Channel said it had not been served with a lawsuit and did not comment on pending litigation.