The running joke is that there is no “D” in Dallas, but the the state of the Cowboys’ defense is no laughing matter.It’s serious business considering Dallas has surrendered a franchise-worst 146 points over the first four games of the season.The Cowboys (1-3) look to repair their ailing defense on Sunday when they host the New York Giants (0-4) in a battle of struggling NFC East teams in Arlington, Texas.Owner Jerry Jones said he’s holding off on any changes and wants to “stay the course.””They need to basically execute the scheme and the plan and … trust the plan,” Jones said of his defensive coaching staff and personnel. “Trust the scheme. You hear that all the time — just trust the play, trust your preparation, trust the play. And that can be challenging if you’ve got a new system, and we certainly have a new system. But there’s other clubs that have new systems, too, especially over on the defensive side of the ball. So, I think we will trust our schemes better.”The sheer numbers are staggering. Dallas is allowing an NFL-worst 36.5 points per game, a league third-worst 430.5 total yards per contest and 172.5 on the ground, which trails only the winless Houston Texans (181.8).Cowboys new defensive coordinator Mike Nolan saw his team hemorrhage a franchise-high 307 rushing yards in its 49-38 loss to Cleveland last Sunday.While defensive end DeMarcus Lawrence was quick to label Dallas’ performance as “soft,” head coach Mike McCarthy went against sounding the alarm on Wednesday.”I just think it’s part of football. I mean I think it’s anytime you have a transition whether it’s a scheme or technique. I think those are the natural hurdles you have to get over,” McCarthy said. “We’re all disappointed that we’re not over those hurdles with more consistency.”Cowboys safety Xavier Woods stressed communication with his teammates while speaking to reporters on Wednesday.”That’s the bottom line: All get on one page, communicate,” Woods said. “When we’re talking about breakdowns, communication, us not lining up correctly or us not seeing things between two people the same way. If one’s wrong and the rest is right, then we’re all wrong.”While the Cowboys’ defense has allowed numbers that boggle the mind, the same can be said for statistics put forth by quarterback Dak Prescott.Prescott is on pace to shatter Peyton Manning’s single-season passing record by nearly 1,300 yards. His 1,690 passing yards through the first four games are 133 more than the previous record total of Pro Football Hall of Famer Kurt Warner, who set the mark when he played with the then-St. Louis Rams in 2000.Prescott completed 41 of 58 passes for a career-high 502 yards on Sunday to become the first player in NFL history to throw for 450 yards or more in three consecutive games.