What is the ruling on honey produced from beehives where the bees drank water from which stray dogs had drunk, and is it permissible to sell it, and is it obligatory to wash the container seven times, one of them with earth, when refilling it?

If a dog drinks from a vessel, the vessel and its contents become impure. The vessel must be washed seven times, the first with earth, for anyone who wishes to use it for drinking or for ablution (wudu').

However, if a bee drinks from water that has been made impure by a dog's lapping, this does not affect the honey; because it is a minor impurity that does not make the bees "jalaalah" (animals that habitually eat filth). Bee honey is pure, and there is no harm in consuming or selling it.