The annual celebration of local truck-building prowess is no longer the Bulldog Roundup.
On Saturday, Volvo Powertrain called it Power Day.
But the bulldog remained the star.
Proud Mack owners parked their vehicles, with bulldog logos, around the plant north of Hagerstown.
Some preferred the live version of the short, squat dog.
Jason Ingream of Greencastle, Pa., a worker on the engine assembly line, walked with his 4 1/2-year-old English bulldog, Macksy — who quickly became a magnet for children.
Ingream said the "sy" at the end of her name was added because she's a girl.
Ingream also brought his 10-year-old daughter, Sheridan, and Hailey Mullen, 10, who lives with them.
Tammy Greenawalt, also of Greencastle, had the same furry idea.
She brought Chopper, a 4-year-old bulldog, who rolled over for belly rubs.
"He's like a big baby and he absolutely loves attention," said Greenawalt, who also had her mother and her nephews with her.
Mack and its owner since 2001, Volvo, are celebrating 50 years of their plant north of Hagerstown.
Each year, the company opens its doors to the public and invites people to share in the Mack/Volvo pride.
Billy Sanders of Warrenton, Va., stood beside his 1946 Mack Model 75, a former firetruck, and 1964 Mack B-53, a former cement mixer that belonged to his grandfather.
Sanders said he owns six Mack trucks, as well as some Caterpillar Crawlers.
"I call it my cats-and-dogs collection," he said.
The lot was filled with old and new trucks, including one from the local trucking company D.M. Bowman, a steady customer.
In one area, a line had formed for "Drive a Truck for a Buck."
Mack merchandise was on sale near the front door — stuffed animals, mouse pads, baseball hats.
Children played on the bouncy rides, sliding down the Vertical Rush and the Accelerator.
The National Guard had a rock-climbing wall and a trampoline-type device that let people do flips in the air while attached to a harness.