Yes, and their work ethic makes it trickier
Australian Shepherds are moderately to notably heat sensitive, and the reason is a combination rather than a single trait. They carry a medium-length double coat with a dense undercoat, they are muscular, athletic dogs built for sustained work, and, most importantly, their herding drive tells them to keep going. An Aussie who is rounding up children, patrolling a yard, or locked onto a ball game will often override early discomfort that would make a calmer breed stop on its own. That means the owner, not the dog, has to set the summer limits. On hot or humid days, treat enthusiasm as no evidence at all that your Aussie is coping, and judge by breathing, responsiveness, and willingness to settle in shade instead.
The double coat insulates, so do not shave it
It is tempting to clip an Aussie short for summer, but that double coat insulates in both directions, shielding skin from sun and slowing heat reaching the body. Shaving can damage that system, expose pale skin to sunburn, and leave the coat growing back unevenly. The better summer grooming is thorough brushing to remove loose undercoat so air can move through the coat properly, especially behind the ears, around the neck ruff, and along the belly where mats trap warmth. A well-brushed Aussie in shade with water manages ordinary warm days reasonably; a matted one does not, even at the same temperature.
Rework the exercise day around the heat
An Aussie still needs serious mental and physical work in summer, so the answer is rescheduling, not cancelling. Move the long run, hike, or fetch session to early morning or after sunset, keep midday outings to short, shaded toilet breaks, and test pavement with the back of your hand before any walk, because hot asphalt burns paws quickly. Swap some midday energy into indoor work: training games, scent searches around the house, puzzle feeding, and trick practice in a cool room tire the brain without the heat load. Provide constant access to fresh water, offer a shallow paddling pool or wet towel to lie on if your dog enjoys it, and never leave an Aussie in a parked car, where temperatures climb dangerously within minutes even with windows cracked.
Watch for the signs this breed hides well
Because Aussies push through, learn their early heat stress signals rather than waiting for obvious distress. Heavy, wide-mouthed panting, thick drooling, a sudden loss of focus on a beloved task, and seeking shade or lying down mid-activity all mean stop at once. If your dog is disoriented, unsteady, or does not improve quickly, contact a vet urgently rather than waiting it out at home, because heatstroke escalates fast and damages organs. Dark-coated and heavily coated individuals, overweight dogs, and seniors will reach that point sooner than a fit young adult.
Summer living arrangements at home
Give your Aussie a genuinely cool resting option indoors during the hottest hours, with airflow, water in more than one spot, and a cool floor surface to sprawl on, since this breed likes to stretch out fully to shed heat. Yard time should always include real shade that moves with the sun, not a shrinking patch that vanishes by noon, and a kennel, conservatory, or sun-trap room is not a suitable daytime space in a heatwave.
Sharing one summer plan across the household
An Aussie's heat safety usually fails through inconsistency rather than ignorance: one person knows the new routine and another follows the old one. Put the exercise times, shade and water rules, and warning signs where every walker can see them, and share any incident, such as a dog who lagged badly on an evening walk, the same day so the next person adjusts. Family Sharing in KinsLe adds a simpler step for this Shepherd in summer: the owner hands profile access to the relatives chosen to walk him.