- " It's very "hostile". I don't like hostility in a doctor's practice."
- —You've Got Hate Mail
Dr. Weisberg is a plastic surgeon who appears in The Looney Tunes Show.
In the episode Bugs & Daffy Get a Job. Daffy asked him to "improve" Daffy's appearance, but changed him back to the way he was before the surgery. Daffy claims that Dr. Weisberg is slappable. He was also the first non-Looney Tunes character to appear after the end credits telling the kids that they shouldn't forget to eat their broccoli, because it's good for them.
Dr. Weisberg appeared in The Float, when he was seen working in the hospital. He informs Daffy that he'll need a kidney transplant.
Dr. Weisberg appeared in The Muh-Muh-Muh Murder, when he gives Lola a cast after she breaks her leg, after chatting and laughing with her.
Dr. Weisberg appeared in You've Got Hate Mail, when Bugs chips his tooth.
Dr. Weisberg appeared in Itsy Bitsy Gopher, when Bugs is bitten by a venomous spider.
Dr. Weisberg appeared in Father Figures, when Foghorn is bitten by Henery Hawk, and was frustrated when Daffy was playing with his rubber gloves.
Dr. Weisberg appeared in The Stud, the Nerd, the Average Joe, and the Saint, where he operates on Daffy, Yosemite, and Bugs.
Dr. Weisberg was mentioned in The Black Widow, when Daffy gets injured.
In Mr. Weiner, he advises Bugs to relax, because his heart is beating extremely fast, and to not go to the fair. Later, he calls Bugs and explains to him that his heart beat is completely normal, since rabbit's hearts always beat extremely fast.