Cesar Millan, known as the 'Dog Whisperer' on his Nat Geo WILD television show, insists a pig that was attacked by one of his dogs is fine.

The dog behaviorist is under investigation after his attempts to rehabilitate an aggressive dog showed the canine biting into the pig's ear in one video clip.

More than 9,500 people signed a Change.org petition to take Millan's show, Cesar 911, off the air and the LA County Animal Control told TMZ that a number of viewers called in to complain that his methods were inhumane.

But another video was released after the onslaught of criticism, showing the French bulldog terrier mix named Simon happily interacting with the very same pig he previously attacked.

Nat Geo WILD also stepped in to defend Millan and said the pig was treated and 'showed no lasting signs of distress.'

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Potential animal cruelty: Cesar Millan known on television as the 'Dog Whisperer' is under investigation after a video surfaced of a dog attacking a pig on his television show, it was revealed on Thursday

Attack: This image shows Simon the dog running towards a pig he later attacked during a training session with Millan. More than 9,000 have since signed an online petition calling for Millan to be kicked off the air

Nat Geo WILD and Millan insist the pig is fine. Another video clip was released to show Simon being rehabilitated. While Simon is reluctant to get pulled along by the pig at first (left), he soon keeps up (right)

A video clip of Millan's show surfaced this week, showing Simon biting into a pig's ear, causing it to bleed.

LA County Animal Control visited his Dog Psychology Center in Santa Clarita, California on Thursday night but Millan was not there at the time, according to NBC.

Animal officials told TMZ that they are looking into the pig's well being after complaints about Millan's methods flooded in.

In an online petition, which has garnered 9,933 signatures, Jill Breitner of Sebastopol, California, accused the dog behaviorist of animal cruelty and using the pigs as bait.

In a statement released by Nat Geo WILD, the nature channel defended Millan, saying he 'created a safe and controlled environment' to rehabilitate 'extreme' cases of dog aggression.

It also argued that because of Millan's work, Simon did not have to be separated from his owner or euthanized.

Nat Geo Wild stood by Millan and reassured viewers that the pig was fine by saying: 'The pig that was nipped by Simon was tended to immediately afterwards, healed quickly and showed no lasting signs of distress.'

In addition to the statement, another video clip was released, this time showing a successful training session with Simon and the pigs.

In the clip, Millan introduces Simon into a pig pen with another dog, who acts as a positive influence as he happily interacts with the animals.

LA County Animal Control visited his Dog Psychology Center in Santa Clarita on Thursday night but Millan was not there at the time. Millan is pictured here with Simon the dog during another training session

Simon slowly follows suit, and the dog whisperer gets Simon close to the pigs without 'having an intention to go after them'.

Soon enough, Simon's leash is attached to the very pig he had attacked. While Simon initially resists getting walked by the pig, he happily trots along in no time.

Millan looks satisfied in the video as he says: 'What they learn is to coexist with each other. Now Simon's learned a different concept - you can follow a pig, you can be near a pig, you can eat with a pig, don't eat the pig.'

Last February Millan was sued by a Florida nurse who claimed a dog named Gus attacked her despite being treated at Cesar's center six days before.