The Best Dog-Friendly Hikes and Lakes Around Mammoth

My huskies have probably logged more vertical feet around this town than I have, and after a summer of dragging them up basically every trail worth mentioning, I've got real opinions on which ones are actually good for dogs versus which ones just happen to allow them. There's a real difference. This is the roundup — the hikes and lakes I'd actually send you and your dog to, with the dog-specific details that general hiking guides tend to skip. For the full human-focused breakdown of any of these, I've got dedicated posts on most of them linked throughout.

Quick Stats

• Leash law: Required essentially everywhere covered in this post — Mammoth's municipal leash law, plus standard Inyo National Forest and wilderness area rules
• Best easy dog hikes: McLeod Lake, TJ Lake, Horseshoe Lake Loop
• Best swimming lakes for dogs: McLeod Lake, Horseshoe Lake, Twin Lakes (upper)
• Toughest dog-friendly hike on this list: Crystal Lake, or Duck Lake if you're going big
• One place dogs are NOT allowed on trail: Yosemite National Park proper

The Easy Wins

McLeod Lake. This is the one I recommend first for basically every dog, mine included. Short, shaded, and it ends at a shallow, sandy-shored lake that's about as forgiving a swimming entry as you'll find in the basin. If your dog is older, out of shape, or just new to hiking at altitude, start here.

TJ Lake. A short, easy walk that passes two other lakes along the way, so your dog gets a lot of scenery and water access for very little mileage. One brief, steep push partway up, but nothing that should trouble a healthy dog.

Horseshoe Lake Loop. Flat, easy, and it's a loop around a lake your dog can see and get excited about from the parking lot. The eerie stretch of dead trees along part of the shoreline is honestly kind of fun to watch a dog investigate, and this is one of the more reliably uncrowded swimming spots in the basin for both of you.

A Step Up in Effort

Heart Lake. Moderate, a little harder to find the trailhead for than it should be, but a good next step once your dog's proven they can handle McLeod or TJ without much complaint.

Emerald Lake, with the Skelton Lake add-on. A solid moderate hike that rewards a dog with real energy to burn, and two lake swimming opportunities instead of one if you tack on the connector.

For the Fitter Dog

Crystal Lake from Lake George. Real elevation gain, real sun exposure on the upper switchbacks, and a genuinely rewarding payoff at the top with swimming on the calmer left side of the lake. This is where I start paying real attention to my dog's pace and panting rather than just letting her set her own tempo, especially on hot afternoons. Good for a dog in real hiking shape; not the one to bring an out-of-shape or heat-sensitive dog on without real caution.

Duck Lake, via Duck Pass. The big one on this list. Nine-plus miles round trip with a genuinely demanding final push to the pass at nearly 11,000 feet. I've brought my dog on this one and she handled it fine, but she's conditioned for it — this is not a spontaneous first-hike-of-the-season kind of trail for a dog any more than it is for a person. If you're going to do it, treat your dog's fitness and heat tolerance with the same seriousness you'd treat your own.

Devils Postpile and Rainbow Falls — Dogs Welcome, With a Catch

This is one of the more unusual dog-friendly hikes in the area, since most national monuments and parks don't allow dogs on trail at all. Devils Postpile does, leash required, and it's a genuinely great hike for a dog given the shade and the river views. The catch, and it's a real one: getting there requires the mandatory shuttle during peak season, and dogs must be both leashed and muzzled to ride the bus. If you don't own a muzzle, you can buy one at the shuttle ticket counter before boarding. Once you're off the bus and on the trail itself, the muzzle comes off — just the leash from there. I've done this hike with my dog more than once and the muzzle rule is genuinely the only friction point in an otherwise excellent dog hike.

The One Place Dogs Can't Go

Worth flagging clearly: if you're anywhere near the Twenty Lakes Basin or Tioga Pass area, be aware that Yosemite National Park itself does not allow dogs on trails, only in developed areas and on paved roads. The trailheads and basin lakes on the Inyo National Forest side are fine for leashed dogs, but don't assume that extends across the park boundary if your route brings you close to it.

Swimming Spots Worth Knowing About

If your dog is more interested in water than mileage, a few of the above are worth calling out specifically as swim-first destinations: McLeod Lake and Horseshoe Lake both have shallow, easy entry points that don't require a dog to navigate steep banks or rocky drop-offs to get in. Twin Lakes, particularly the upper lake near the waterfall, is another solid option if you want a swim spot with a bit more room to spread out.

What to Bring for a Dog Hiking Day

A leash, obviously, and a sturdy one. This isn't optional anywhere on this list, and enforcement in town and on trail has gotten more consistent, not less.

Paw protection. Granite and rocky trail sections show up constantly on this list, and hot exposed rock in peak summer can genuinely burn paw pads. Booties are worth having even if your dog only tolerates them some of the time.

A collapsible water bowl and enough water for your dog, not just yourself. Lake access covers a lot of these hikes, but not all of it is easy or safe for a dog to drink from directly, and altitude dehydrates dogs faster than people expect.

Sun and heat awareness on the more exposed hikes, Crystal Lake and Duck Lake especially. Watch panting and pace, not just mileage covered.

A muzzle, specifically if Devils Postpile or Rainbow Falls is on your list and you'll be riding the shuttle.

A basic pet first aid kit for the longer, more remote options like Duck Lake, where help is genuinely far away if something goes wrong.

A Few Things I've Learned the Hard Way

• Match the hike to your dog's actual condition, not their enthusiasm. Mine will start any hike at full speed regardless of whether she's ready for it.
• Bring the muzzle for Devils Postpile before you get to the ticket counter and realize you forgot. Buying one there works, but it's an easy thing to plan around instead.
• Watch paws on the granite-heavy trails, Crystal Lake in particular. I've had to turn back early once because I didn't check often enough.
• Don't assume every trail near a national park boundary allows dogs. Double-check before you commit, especially near Tioga Pass and Yosemite.