A younger adult dog usually copes with a hot spell by slowing down and drinking more. A senior dog has less reserve behind the same behaviour: older bodies regulate heat poorly, stiff joints make getting up to reach water harder, and many age-related conditions and their medications leave less margin when the temperature climbs. Treat hot days as rest days for her, planned around coolness rather than around the usual walk routine.
Rebuild the Day Around the Cool Hours
Keep walks to the cooler hours, early morning or late evening, short and unhurried, on grass or shaded ground where you can. On very hot days, skip the walk entirely and offer garden sniffing in shade instead, letting her wander, sniff and toilet at her own pace. A senior who misses a day's walk loses little; a senior pushed through midday heat can be in trouble quickly. Test any paved surface with the back of your hand before crossing it, and carry her water with you even on a short outing rather than relying on finding some.
Indoors, give her a cool resting place she can reach without stairs or a struggle, with air moving through it from an open window or a fan in the room. Tile or a cool mat in a shaded corner suits many older dogs better than a deep warm bed on a hot day, so offer the cool option alongside her usual bed and let her choose. Place water bowls in several spots, including beside that resting place, and refresh them through the day, because a stiff dog who has to cross a hot house to drink may simply not bother. Do not leave her shut in a car, even briefly, or in a conservatory or sunroom that heats up through the day.
Watch Earlier and Read the Small Signs
Check on her more often than you would a young dog, because seniors can slide into difficulty quietly and recover slowly. Early signs that heat is beating her include restless panting, seeking cool floors, drinking much more than usual, or seeming reluctant to get up. Heavy panting that does not settle in the cool, drooling, weakness, wobbliness, disorientation, vomiting or collapse are distress signs, and they change the response from watching to acting.
Keep grooming comfortable through a hot spell, with loose coat brushed out so air reaches the skin, but do not clip her coat short in the belief that shorter always means cooler: for many dogs the coat also shields skin from the sun. If she seems off her food during a heatwave, offer meals in the cooler parts of the day and tell the vet if her appetite does not return as the weather breaks, rather than assuming the heat explains everything.
If She Overheats: Cool Gently and Call the Vet
Act in this order. Move her into cool shade or a cool room, and offer small drinks of cool water without forcing her to drink. Begin gentle cooling: pour or sponge cool water over her coat, especially around the neck and belly, or lay a damp towel over her while you arrange help. Gentle is the key word. Never use ice or plunge her into cold water, because harsh chilling can do harm of its own and makes assessment harder for the vet.
Contact a vet fast whenever distress signs have appeared, even if she seems to perk up as she cools, and keep cooling gently while you travel if the vet advises bringing her in. Tell the vet how long she was in the heat and what you have done, because that timeline shapes their advice. With KinsLe, her Pet Passport gathers the vet's number, the after-hours emergency service, her conditions and her medication notes into a single packet, so the details a vet asks for are in your hand instead of scattered at home.