The dog park was relocated due to construction of BART's Warm Springs Extension subway, which will travel through the park, spokesman Jim Allison said.
The new park, located in the western part of the park adjacent to the Fremont police station, features a 1.2-acre area with an AstroTurf surface for larger dogs, as well as a smaller grassy area for dogs that are less than 14 inches tall, Allison said.
There are also benches, shade structures and drinking fountains for both dogs and their owners, he said.
The park was previously located in the eastern part of the park between the softball and soccer fields.
The opening of the new dog park was being celebrated this morning with a ribbon-cutting by Fremont Mayor Bob Wasserman and BART board director Thomas Blalock.
PETCO, the Fremont-based Tri-City Animal Shelter, and the organization Paws 4 Learning were also scheduled to be at the grand opening to give canine treats and tips, animal adoption information and dog training demonstrations.