Overview
"Problem Dog" is the seventh episode of the fourth season of the American television drama series Breaking Bad, and the 40th overall episode of the series. It originally aired on AMC in the United States on August 28, 2011.
Plot
After Skyler White tells Walter White that she has negotiated the return of Walter Jr.'s Dodge Challenger to the dealership, Walter angrily drives the Challenger to a parking lot. There he burns donuts and strands the car on a concrete parking divider, then stuffs the ownership papers in the gas tank, lights them afire, and blows up the car. Saul Goodman covers up the outburst, which costs Walter $52,000.
When Walter later drops off approximately $274,000 — his biweekly profits — to Skyler, she is stunned by the amount, unsure how she will launder his annual meth-lab earnings of over $7 million, in mostly $50 bills, through their car wash. Meanwhile, Hank Schrader visits Los Pollos Hermanos with Walter, Jr. and manages to get Gus Fring's fingerprints on a cup.
Walter convinces Jesse Pinkman to use his new position as a henchman in the organization to kill Gus, and concocts some ricin poison in the lab that Jesse hides in one of his cigarettes. Mike Ehrmantraut brings Jesse along to a sitdown between Gus and the cartel. Jesse is told to make coffee for the meeting and contemplates poisoning the coffee, but he is interrupted before he can act. Mike is surprised when the cartel sends only one man to the meeting, who delivers to Gus an ultimatum. Gus, who had been prepared for a negotiation, rejects the ultimatum. Jesse contemplates shooting Gus as the cartel representative leaves but decides not to. Mike later tells Jesse that Gus is impressed by Jesse's loyalty, but that he thinks it's "for the wrong guy."
From Wikipedia (CC BY-SA 4.0).