Rinse salt water and sand from your dog's coat after swimming.

Thank you for posting this, I actually had no idea salt water was this harmful to dogs! 😦
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There are many signs of salt poisoning in dogs, which may be neurological, gastrointestinal, or even cardiovascular. The most common signs are extreme thirst and urination, which are what usually saves your dog’s life if there is plenty of fresh water to drink. This is because the water dilutes the salt in the blood, and it is cleansed from the body in the urine. The symptoms of salt poisoning most often reported are:
Well dogs know that the water is salty but of drinking in the lake it’s okay as long as your dog have vaccine.
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Salt water intake – Dog owners should be aware of salt water poisoning, which occurs when dogs drink too much salt water. Dogs often will swallow a small amount of salt water while playing on the beach, so it is normal to notice minor diarrhea or frequent urination. But if your dog vomits, refuses meals, becomes lethargic or displays neurological issues, your dog is most likely suffering from salt water poisoning, the result of dangerously high levels of sodium in the bloodstream. Seek immediate veterinary care If you notice these signs. To avoid salt water poisoning, make sure your dog always has plenty of freshwater nearby. However, is ocean saltwater safe for dogs? The answer is, no. Dogs can have many side effects due to drinking saltwater.
Photo provided by FlickrDue to celular osmotic action, the salt water can cause toxicity in dogs.
Photo provided by FlickrMany dogs love to drink salt water at the ocean—but it's not good for them
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Most dogs love running, playing fetch, and interacting with other dogs, and a trip to the beach can be a perfect opportunity for your dog to do those things. However, exercise causes increased water loss through muscle contraction, respiration, and evaporation from the skin. Your dog needs to replace that lost water; exercise will leave him with an urge to drink. If you don't provide fresh water often at the beach, your dog will drink salt water. If your dog drinks a smaller amount of salt water, he might succumb to the phenomenon known as "beach diarrhea." This type of diarrhea occurs because the salt water has caused excess amounts of water to accumulate in your dog's intestines, as discussed above. Beach diarrhea has the following characteristics: Salt water has an osmotic effect, pulling liquid into your dog's intestines. This can cause diarrhea, which contributes to dehydration. If your dog drinks too much salt water too fast, he could vomit, leading to further dehydration. Even if your dog doesn't actually drink salt water, he can ingest small amounts by handling salt-water-soaked balls and toys or by swimming in salt water. Slowly introduce your dog to an oral care routine. First, get them comfortable with having activity around their mouth and teeth. Gently stroke the outside of their cheeks and lips with a finger. Gradually introduce a dab of veterinary toothpaste on your finger, letting the dog taste it. Never use toothpaste designed for humans, as this may upset a dog’s digestion. A dilution of salt and water can also be used instead of toothpaste. Keep brushing sessions brief, just a couple of minutes a day. Praise and reassure your dog to keep the experience positive. Discourage your dog from drinking salt water by offering clean, fresh water frequently while on the beach. Carry a small bowl or collapsible dish for this purpose; ideally, the container should be one your dog is familiar with. If you don't have a container or your dog won't drink willingly, use a water bottle with a sports cap to squirt fresh water into your dog's mouth. Add 1/2 teaspoon of salt. Salt is not antibacterial, but salt water mouthwash can temporarily alkalinize your dog's mouth and create an inhospitable environment for bacteria.