Casey just showed off her sweet little dog online. Dr. Drew and his guests wonder if she should be allowed to have a dog, and what kind of owner she'll be.

A new video has surfaced online of Casey Anthony. HLN's Dr. Drew and his guests take a closer look.

Casey Anthony has popped up in a YouTube video spilling her guts publicly for the first time since she was acquitted in the murder of her daughter, Caylee. What does she say about the little girl? Nothing! Her attorney confirms it's Casey, and says the video was not for all of us to see. So who is it for? Dr. Drew has a theory or two about Casey's motivations.

Plus, a man police call a serial arsonist terrorized Los Angeles during the holidays. He may have autism. Could the condition be used as a legitimate defense? Dr. Drew and his guests look into the suspect, his alleged mental state, and other issues surrounding the bizarre case.

Watch Dr. Drew tonight and every weeknight at 9 on HLN.

On Tuesday night, Dr. Drew talked to the medical examiner who rocked the Casey Anthony trial with her revealing testimony about Caylee Anthony.

“Dr. G., is it your opinion that Casey got away with murder?” Dr. Drew asked Dr. Jan Garavaglia at the opening of the interview.

“That`s not my call, Dr. Drew.” Dr. Garavaglia responded. “My call is to state what happened and to state my opinion on the manner. And I still feel very strongly that this is a homicide.”

Dr. Drew mentioned how lead prosecutor Jeff Ashton had argued vigorously that the duct tape was an indication of the means of death. “Was that something you adhered to?” Dr. Drew asked.

Dr. Garavaglia responded, “it certainly could be. I never stated it wasn`t. The problem is, I couldn`t say scientifically that it was definitively over the nose; over the nostrils. It certainly could have been. But I couldn`t really defend that. But we certainly see homicide victims with tape over just the mouth to keep them quiet. So, I just didn`t feel like that was scientifically defensible. And there was probably other things going on with this little girl to cause her death besides just the tape.”

Dr. Drew interjected, asking what she was speculating during that time.

“Oh, now, people don`t understand that just because we didn`t find chloroform and because we didn`t find drugs in her bones, does not mean that they were not there,” she explained. “I think there was some indication that that was a real possibility. Certainly, she`s in a plastic bag. She could have been in the trunk. There`s some indication of that. So, there are a lot of different possibilities. I just couldn`t say for sure how that all fit together. But, clearly, we can say that the pieces fit together as a homicide.”

Dr. Drew later asked what her response was to those who criticized her for not opening Caylee’s skull.

“It was not needed," she said. “It wasn`t needed there then. You know, that was an anthropologic exam. You know, I have never done an autopsy where I haven`t opened the calveria to take the brain out to look inside. These were completely disarticulated, completely dry bones. And I had two very prominent forensic anthropologists working every moment with me on those bones. And we never - none of us felt that that needed to be done.”

Hear more from Dr. G and lead prosecutor Jeff Ashton in the video clip above.

You can watch more of Dr. Drew weeknights at 9 p.m. ET/PT on HLN and follow the show on Twitter @DrDrewHLN.

We're live tonight as the Iowa caucuses take place! Get Dr. Drew's unique take on the candidates as people. Who are they? What makes them run? Why does anyone want to be president? Are they saying one thing and meaning another?

And, Casey Anthony trial witness Dr. G. is here. She'll tell us about her testimony for the state and why she believes Caylee's death was a homicide. Prosecutor-turned-politician, Jeff Ashton, joins the discussion. You won't see it anywhere else!

Watch Dr. Drew tonight and every weeknight at 9 on HLN.

Casey Anthony, Robyn Gardner and Amanda Knox dominated the 2011 media coverage. Was this the year of the femme fatale? Dr. Drew and his guests discuss their stories.

Cindy Anthony seems adamant that George didn't molest Casey. Is she just standing by her man? Dr. Drew discusses with his guests.

Casey Anthony's parents say they believed all of her lies. Dr. Drew and his guests weigh in.

Should we believe what George and Cindy Anthony are telling us now? Dr. Drew and guests discuss the issue.