Oscar-nominated actor Joaquin Phoenix has hit back at co-star Eva Mendes - for branding him an immature "puppy dog". During a press conference at the Cannes Film Festival, Mendes said of her We Own The Night co-star, "working with Phoenix was kind of like working with a puppy dog or a two-year-old." But Phoenix refutes the comments, insisting he was only doing his job - and couldn't care less what she thinks of him. He says, "Had I known I was supposed to be a puppy dog, I would have been much more cute and more consistently attentive. My apologies, Eva, but I had a few other scenes that you weren't in. This puppy dog had a lot of work to do."