Mission Trails Regional Park is a water category place in San Diego. It is a dog friendly hike with 60 miles of trails available for visitors and their pets. The park features a lake for boating and camping.

William Heise County Park in Julian, California, is a dog-friendly area with interpretive trails. Dogs are permitted on trails if properly restrained on a leash no longer than six feet and attended at all times. A pet fee of $1 per night per dog applies. Shaded areas are available on some trails.

Santee Lakes Recreation Preserve in Santee, California, is a dog-friendly destination, primarily for its campground and designated pet walk areas around Lakes 6 and 7. Pets are not permitted in the Day Use Park (Lakes 1-5). Dogs must be leashed (max 6 feet) and attended. An off-leash bark park and waste stations are available for campers. Up to three dogs are allowed per campsite.

Penasquitos Creek Waterfall, part of Los Penasquitos Canyon Preserve in San Diego, is a dog-friendly trail. Leashed dogs of all sizes are welcome on the trails, which lead to a seasonal waterfall. Dogs must be kept on leashes no longer than 8 feet. Some shaded areas are available, and dog waste disposal is provided.

Point Loma Tide Pools is a trail in San Diego that is dog friendly. Dogs of all sizes are allowed on the Coastal Trail and at the tide pools. Multiple dogs are permitted. There is an admission fee for visitors.

Anza-Borrego Desert State Park in California allows dogs on a 6-foot leash in campgrounds, on designated park roads, and on the Visitor Center/Campground Trail. Dogs are not permitted on hiking trails or in wilderness areas. Pets must be contained in a tent or vehicle at night and not left unattended.

Los Peñasquitos Canyon Preserve is a dog-friendly trail in San Diego. It welcomes dogs of all sizes, and multiple dogs are allowed. Visitors must keep dogs on a leash at all times. The preserve offers shaded trails and access to a creek for cooling off.

Cowles Mountain is a dog-friendly trail in San Diego. Dogs are allowed on leash; it is not a leash-free area. There is no shade and no water stations, so bring your own water. Avoid hot hours due to high temperatures and risks like rattlesnakes. Multiple dogs are permitted.

Piedras Pintadas Trailhead is a trail in San Diego. It is a dog friendly hike. Multiple dogs are allowed. The trail offers various smells for dogs to investigate. No pet fees or size restrictions are mentioned.

Lake Jennings in Lakeside, California, features a pet-friendly campground. Up to three leashed dogs of any size are permitted per campsite for a nightly fee. Dogs are allowed on the flume and campground loop trails but are prohibited from the Lake Loop Trail, recreation areas, shoreline, and water. Owners must clean up after their pets.