Since the Oscars, Uggie has not heard from his co-star Jean Dujardin. Uggie is working on his memoir, “Uggie the Artist: My Story,” out in October, and Mr. Dujardin is making movies in France Mr. von Muller said. “I’m sure they’ll get together one of these days.”

As for whether all the attention has gone to Uggie’s head, it has, “a little bit,” Mr. von Muller admitted. “He used to listen all the time. Now he’s lacking a little bit, he’s like ‘Hey, you know,’ he’s like, ‘I want to do more stuff on my own.” Still Uggie worked his tail off on the red carpet.

The documentary “shows the deep love we have for animals but also a lot of the underside of our fascination with dogs,” Ms. Miceli said, adding, “a lot of dogs end up homeless and being euthanized.”

In the film you’ll see a West Boca couple who pay $150,000 to clone their Lab, and the orthopedic surgeon from Haddonfield, N.J., who spent hundreds of thousands of dollars in court in court to defend his Rhodesian Ridgebacks after they bit children, including an incident where a 4-year-old girl’s ear was ripped off.

But it is the dogs and the people who save them who are the heroes of this documentary, and the third segment of the documentary, “Betrayal,” will break your heart.

“I know you came to see Uggie,” Ms. Nevins told the audience before the film, adding how she’d rescued her dog, Bogie from a kill shelter in Georgia. She warned the audience about some of the horrific scenes in the “Betrayal” segment of the film. “How far do you go? Maybe I go too far,” she said, “but I think sometimes you have to see the horror to make a change.” There are warnings before the worst parts. “If you really can’t stomach it, just close your eyes,” she said, adding, “Let’s save dogs!”

After the screening, a rep from the Human Society, which also hosted the screening, invited guests to play with some dogs available for adoption, including a 3-month-old toy poodle that loved being held, and a cairn terrier flat on his back making happy, gurgling noises as someone scratched his chest.

Uggie was on a banquette resting. We petted him and he looked into our eyes. He looked pooped. Mr. von Muller told us Uggie’s big starring roles in films were over. “No big movies. He’s old. Little things here and there, no problem, but anything that has to do with long hours I’d really like to keep him away from that.” The next morning Uggie would be flying back to L.A., and he flies first class of course. “He has his own seat in business,” Mr. von Muller said. Who would expect less for a big movie star?

“One Nation Under Dog: Stories of Fear, Loss & Betrayal,” will premiere on HBO on Monday, June 18 at 9 p.m.