Hi mirela
Don�know if this will help, but ..............
My lab / alsation cross loves going in our pool, and it�s so hot here in Spain that it would be cruel to stop him.
Unfortunately he turned a sort of funky bronze tinted colour and started to smell like a dead pig! A more well travelled friend said it reminded him of a wrestler�s jock strap!!
One of our neighbours had a visitor who was researchig food additives to improve smelly dogs, and explained that increasing fish oil intake had been promising - and it worked. Once a week we give him a small tin of tuna in olive oil (he is a big dog so a full tin is no trouble to him), and now restrict him to three swims per week, followed by a wash in a decent ( but cheap) dog shampoo recommended by the vet.
He is now as happy as Larry - whoever Larry is - with a lovely shiny coat, and he smells fine.
The only downside is that he is a far better swimmer than me, and keeps rescuing us from the pool!
Pity you don�t have low charges over there like our vets, who are excellent and very caring.
Good luck with the treatment