My dog Bramble - (I had had her for 5 weeks now, she is from a shelter) is obsessed with drinking rainwater I have bowls and a birdbath outside for birds which I keep clean but she drinks it all. I keep her water bowls clean and I change her water very frequently during the day. Is this normal ? Does rain just taste better? she drinks out of my friends wildlife pond - as does her cat by the way they both walk past water bowls to drink from the pond, and she drinks out of puddles as well.