A dog who spends a day fetching from the sea can swallow far more salt water than her body can handle, mouthful by mouthful, while playing. The signs that follow have a shape worth learning, since the early ones look like an ordinary upset stomach and the later ones are a toxin emergency. Dogs at extra risk are the keen swimmers, the ball-chasers who gulp as they grab, and small dogs, for whom a given amount of sea water is a larger load. The reporting facts matter from the start, so fix them in your mind at the beach: roughly how long she was in the water, how much she seemed to drink, and when the session ended.
The early gut signs after the beach
Repeated vomiting is usually the opening sign, arriving during the session or in the hours after it, sometimes with sea water and foam coming back plainly. Diarrhoea often follows, and she may seem subdued, thirsty in an unsettled way, or off her food that evening. A single vomit after obvious gulping, in a dog who then settles, brightens, and moves normally, still earns close watching and a low threshold for phoning the clinic for advice. Vomiting that repeats, diarrhoea that continues, or a dog who stays dull is past the watching stage. Do not try to make her vomit at home under any circumstances, and do not offer any home remedy; your work is observation, reporting, and routing.
The nerve signs that make it an emergency
Wobbliness is the turning point. A dog who staggers, knuckles her paws, or cannot place her feet steadily after a beach day is showing signs beyond her gut, and tremors, muscle twitching, disorientation, or seizures complete the emergency picture. These signs mean urgent veterinary care now: phone the clinic or an emergency service at once and travel as directed, keeping her safe from falls and stairs on the way. There is no wait-and-watch version of this stage, and no home step that substitutes for the clinic. If she collapses or seizes, protect her from hard edges, time the episode, and get moving. Tremor and nerve signs outrank every other consideration, including finishing a meal, waiting for a partner, or seeing whether sleep helps.
What to report when you phone
Report the exposure in numbers and times: how long she spent in the sea, your honest estimate of how much she drank, whether she was fetching and gulping or paddling calmly, and when the session ended. Follow with the sign sequence in order — when vomiting started, how often, whether diarrhoea followed, and exactly what changed in her walking, alertness, or muscle control. Mention her size, age, and any known conditions, since load relative to body weight shapes the clinic's judgement. If she may also have eaten something on the beach, say so; extra facts never clutter a toxin call. Photograph nothing and fetch nothing at the cost of delay; the report travels by phone ahead of you.
Lowering the risk on the next beach day
Offer fresh water often during the session, before she is thirsty enough to drink the sea for relief, and build shade rests into the day away from the waterline. Favour games that keep her head out of the water over repeated deep fetches, and call time on swimming when gulping becomes constant. Rinse the salt from her coat afterwards, dry her, and watch the evening with the same sign list in mind even after a session that seemed moderate. Any repeat of the gut signs shortens the next session and earns a mention at her routine visit. Her Pet Passport in KinsLe stores the beach date, your exposure notes, and the sign timeline together, ready if a clinic ever needs the whole account.