Good luck! Seriously, once they experience it, it's very hard to keep them out. Jenny, our older golden(age 13) still swims. She actually will go to the bottom of the pool to retrieve things. It's real important to keep the ears clean and dry. The ear flaps hold moisture in. Those nasty ear problems are commonly caused by "wet" ears.
Goldens and water go together like.......gosh, water and goldens I guess!!!
While we don't have a lake or anything nearby, I remember having a 'swimming pool' in the kitchen a few times caused by Jessie 'digging' in her water bowl! She'd dig, and dig, and dig, all the water would be on the floor, and the water bowl empty!
And she'd look up at you with the, "Well, hey, whats a dog gotta do to get a drink of water around here eh?" look!!! LOL
So you'd fill it up, and again she'd dig!!!!
Now I have one of those wide bottomed squat buckets, and touch wood, while there are times I have a few puddles on the floor, they are no where near as bad as the old swimming pools of old. Now that I have Jessie, as well as Shadow, at least I know there's drinking water for them now!
Same goes for their water bucket under the house......they will both plunge their feet in it, or throw in a rock or toy, and then 'dig' for it, to retrieve it.
While I'd yell at the kids if they made puddles like that, all I can do with Jessie and Shadow is stand there, laugh, shake my head, and fill up the buckets again!!!
We have a swimming pool at home, and we never told Aimé not to swim, so of course she does so regularly, even in winter. SHE has located the place where she keeps her puppies very near, so she can swim and come back to them immediately. The problem is now that the pups get wet too because she returns to them all wet. Fortunately the weather in Mallorca is very mild these days, or else the poor pups would freeze if I'm not near to dry them. I found some of them, the fattest ones, had problems in their navels, because it seems as if the dampness does not allow the cicatrization.
What about eating the fish? I can't keep her away from the fish. She chews on them constantly. Will this hurt her in any way? I get them away from her as soon as I see her with one in her mouth but it is a constant chore.
I sure didn't realize what a responsibility this was going to be... !
I am sure of this...between the dog and the kids, I will sure be crazy soon!!!
Well, maybe she isn't crazy after all. I just didn't realize dogs liked to eat fish. I knew I was feeding her enough...I guess it is just a Golden thing.
I am sure now that these weekly baths are going to stop. There is no way to keep her out of the lake. One good thing about having her is I know that she is going to keep the Canadian geese out of the yard!!! No more messes from them!!!
Make sure he is not eating Salmonids, trout, salmon, etc...
They carry a parasite called Nanophyetus salmincola which is a vector for Neorickettsia helminthoeca... a rickettsial organism which causes severe life-threatening infections in dogs. "Salmon poisoning" can be fatal if left untreated.
A short answer to the question is NO!!!
All of my Goldens love water, some swim more than others but they all love being WET and preferably muddy.
Our oldest dog  still loves to swim and will head for any amount of water. The younger two have taken to wallowing in any standing water getting as wet and dirty as possible.
The funny thing is NONE of them like being bathed. OK, they cooperate and dont make a fuss, but they all hate that soapy experience!
Our vet has told me that to get Mojo's ear clean we should use a cotton ball with a little mineral oil on it. The wax will stick to the oil and come out easy. I keep the hair trimmed around the inside of the ears so the heat doesn't become a problem and cause infections and I also thin the hair on the top and around the ears (especially in the summer). This is how goldens are done for the ring and it looks a lot cleaner and cooler for them.