We have just had a week by the sea and both dogs spent ages in there. We didn't bath them as I wasn't worried about the seawater and it didn't do them any harm.
Woofie was sick several times and had the squits after the first day but then he wised up and didn't drink it!
But I was a stupid horrible mum with poor Maddie, she had a harness on and after 3 hours in and out of the sea, the harness got covered in sand and rubbed her raw underneath her armpits. I didn't notice until the next morning after she had been licking it all night. Poor baby, she was so sore

I won't do that again!