Well it's definitely not in
The Animal Welfare 2006 Act.
Having done a search there for the word "water" there's no mention of it at all. I doubt that dogs would be required to have access to water 24/7 by law otherwise it would be an offence to walk a dog without carrying a supply of water, which whilst this may be prudent (particularly in hot weather) is not to my knowledge, currently a legal requirement in this country.
However, having said that I
DO believe that dogs should normally have ready access to fresh water and also that it is checked & changed regularly especially on warm days.
I, despite my earlier comments suggesting it would probably be ok not to, did leave water for my two in their cage overnight when they were pups because I was using stone bowls which were not easy to tip.
I stand by what I said though & I don't think that, so far as they were concerned, they would have suffered unduly by not having any water over the short overnight period. I base this on what I saw of my two as pups and what they actually drank overnight as could be seen from what was left in their water bowls in the morning. (It actually really grinds for me to say that as I don't often disagree with what Teri has to say and I don't like doing so as I think she speaks a lot of sense in her posts).
Also, I do think that this is a case of differing opinions and I can't see how it could be otherwise if we hold different views on this ? It's not just on this board though as a quick search online will confirm but also between many so called dog experts elsewhere on the internet who have conflicting views about this subject.
I think I could probably sum up my view as this, it is clearly desirable that dogs have access to fresh water as often as posible and ideally at all times (as mine do at all times when in the house or out in the car) although 24/7 taken literally maybe difficult to achieve. I think there may be some occassions when it is preferable, as in the case in point, ie pups in a cage overnight, tipping bowls and "perhaps" having to sleep on wet floors/bedding that the water supply is removed for a short while. In the absence of any other immediate solution to this such as those suggested it would be ok in my view to remove their water supply overnight so long as they have access to water until late evening and again in the early morning.
As I said, I base this on what I saw of my two as pups who very rarely seemed to drink anything at all from their bowls overnight and would not in my opinion have suffered to any great extent or would it have been have been cruel were their water supply not available for that time. They were usually asleep when the water bowl was replaced at around 11pm perhaps opening an eye or two to see what was going on and then the next I knew they were up and jumping about ready for a wee at about 6am with their water bowls usually untouched.
Perhaps this is unusual for pups, I don't know and others may have different experiences but so far as my two were concerned this is how it was & why I think it's ok.
We may have to agree to differ on this subject as it appears others all over the internet seem to have done before us ! :)