Two days after celebrating their biggest victory of the season, the Indianapolis Colts dealt with their biggest loss.

Quarterback Andrew Luck is expected to miss at least two to six weeks because of a lacerated kidney and a partially torn abdominal muscle, injuries he sustained late in Sunday's victory over the previously unbeaten Denver Broncos.

"When you take a hit to a franchise quarterback, it is a tough blow," Colts coach Chuck Pagano said Tuesday.

Pagano said he believed Luck was injured in the first minute of the game when he tried to scramble for a first down. Linebacker Danny Trevathan squared up on Luck from the front while defensive end Vance Walker hit Luck hard on the side of his left shoulder, bending him over awkwardly.

The hit immediately drew gasps from Colts fans, but Luck broke the 17-17 tie on the next play with an 8-yard pass to Ahmad Bradshaw, his second TD pass of the game.

The Colts, on bye this week, will turn to 40-year-old Matt Hasselbeck, as they did last month when Luck missed two games because of an injured right shoulder. Hasselbeck won both.

Dog taunter?

An Oakland linebacker is being investigated to determine whether he illegally taunted a police dog before a game in Pittsburgh vs. the Steelers.

Pittsburgh television station WTAE said a sheriff's deputy working with the dog Sunday identified the Raiders player as Ray-Ray Armstrong.

Chief Deputy Kevin Kraus said a player lifted his shirt, beat his chest and barked at the K-9 before telling a deputy to release the dog.

Taunting a police dog is a third-degree felony in Pennsylvania.

Etc.

• Star cornerback Aqib Talib will sit out Denver's game vs. Kansas City after losing his appeal of a one-game suspension for poking Colts tight end Dwayne Allen in the eye. NFL spokesman Michael Signora said Talib's punishment was upheld by Derrick Brooks.

• Chicago rookie tackle Tayo Fabuluje was suspended four games for violating the NFL's policy on performance-enhancing substances. A sixth-round draft pick, Fabuluje has appeared in four games.

• The New York Jets signed kicker Randy Bullock to replace Nick Folk, who was put on injured reserve due to an injured right quadriceps.

• Washington put center Kory Lichtensteiger on injured reserve with a designation to return and replaced him on the roster by signing center Brian de la Puente.