On a weekday morning at Dakota Memorial Dog Park, Diesel, a Jack Russell terrier, eagerly leapt at a tennis ball held by his owner, Cindy Rotermund.Rotermund, a retiree who recently moved to the area, said she regularly comes to the off-leash dog park with Diesel and Newton, her pointer. She said it’s good for her pets to be off leash so they can run around, play with and sniff other canines — just be dogs.But Rotermund said she actively avoids coming to the park on the weekends, when she’s heard there can be up to 100 dogs in the 8-acre park.“Maybe the dogs would like it,” Rotermund said. “But not me.”As Clark County’s population continues to grow, newcomers are bringing their dogs with them and putting new strains on the county’s off-leash dog parks. Now, the parks, which have periodically faced closures and financial challenges, could all close.The parks are maintained by local nonprofit DOGPAW, which stands for Dog Owners Group for Park Access in Washington. Mark Watson, the group’s board president, said DOGPAW has turned to the county for help in managing the increasingly packed parks that he said are becoming rife with conflict and dangerous situations.