We’ve been tracking the line movements for the 16 NFL games scheduled for Week 4 and have come across some interesting information in the process. The following five games have experienced the most movement since opening at the Las Vegas Hilton Sunday evening.

To track the lines or see what the betting public is up to, check out the NFP Sportsbook Sniper.

NEW YORK GIANTS (2-1) at ARIZONA CARDINALS (1-2)

Time: 4:05pm eastern
Opening line: Giants -3
Current line: Pick (3-point swing)
Current betting patterns: 80% of bets placed are on NYG

Analysis: Remember back in Week 1 when the Baltimore Ravens blew out the Pittsburgh Steelers and then hit the road and laid an egg at Tennessee in Week 2? Apply that logic here and you’ll understand why this line has plummeted as far and fast as it has. New York is coming off an impressive upset win over Philadelphia, but could be walking into a trap in Week 4 at Arizona. Be advised that the Cardinals are 7-2 against the spread in their last nine games as a home underdog.

WASHINGTON REDSKINS (2-1) at ST. LOUIS RAMS (0-3)

Time: 1:00pm eastern
Opening line: Redskins -1.5
Current line: Rams -1 (2.5-point swing)
Current betting patterns: 84% of bets placed are on Washington

Analysis: Back-to-back road games on short rest is no easy task in the NFL, which is one of the key reasons why this line started moving towards St. Louis quickly after it was posted. A 0-3 start could have the Rams a bit undervalued heading into Week 4. In addition, take note that the Redskins are 1-5 against the spread in their last six games when playing on Sunday following a Monday night game.

DETROIT LIONS (3-0) at DALLAS COWBOYS (2-1)

Time: 1:00pm eastern
Opening line: Cowboys -3
Current line: Cowboys -1 (2-point swing)
Current betting patterns: 87% of bets placed are on Detroit

Analysis: The 3-0 upstart Lions will continue to feel the love from the public as long as they keep winning, while bettors saw first-hand just how bad Dallas can be with the laundry list of injuries that has decimated their offense. The Cowboys are on short rest, their quarterback is banged-up and they are playing host to arguably the hottest team in the league this Sunday. Keep in mind that the Cowboys are 1-6 against the spread in their last seven games as a home favorite.

MIAMI DOLPHINS (0-3) at SAN DIEGO CHARGERS (2-1)

Time: 4:15pm eastern
Opening line: Chargers -9
Current line: Chargers -7
Current betting patterns: 65% of bets placed are on Miami

Analysis: Can the Chargers be trusted? That’s the big question after this high-powered San Diego offense managed just 20 points in an unimpressive 20-17 win over the Kansas City Chiefs in Week 3. Can the Dolphins score in the red zone? That’s another big question as Miami currently ranks 29th in the NFL in red zone scoring efficiency. Keep in mind that the Dolphins are 5-1 against the spread in their last five games against the Chargers.

NEW ENGLAND PATRIOTS (2-1) at OAKLAND RAIDERS (2-1)

Time: 4:15pm eastern
Opening line: Patriots -6
Current line: Patriots -4.5 (1.5-point swing)
Current betting patterns: 86% of bets placed are on New England

Analysis: Home dogs are 11-6-2 so far in 2011, which is one of the main reasons why the sharps may be backing the Raiders early in the week. Another reason could be the fact that after three games, New England ranks dead last in the NFL in total defense. The Raiders have looked good this season, but you have to remember that the Patriots are 5-0 against the spread in their last five games following an ATS (against the spread) loss.

Hit me up on Twitter: @JoeFortenbaugh