Maybe buy the neighbor a water filter?
If the tap water is giving the dog the squirts, I wonder what it's doing to the neighbor?
The neighbor is likely fine. Water supply is an interesting study. Actually it only takes subtle differences in water chemistry to elicit a drastic response from your digestive tract. Water supplies in most metropolitan areas are fairly innocuous - low disolved solids, too much chlorine, maybe excess fluorine. Maybe other shit. Nukes your gut biome to where even a slight change in water makeup can result in drastic gut responses. Stay in the same place for years drinking the same water and then make a road trip to Aunt Sally's farm, and all hell breaks loose.
Aunt Sally lives out in the boondocks and has a well. The well is founded in 80 feet of dolomite and there's no chlorination. It isn't densely populated out there, but everyone has a septic system and water bacterialogic tests always show a touch of colliform bacteria - nothing excessive, but its there. Everyone out there isn't effected by it, because its what everyone is used to.
So you drink a couple glasses of her water in the AM. Tastes good - cold and clean. But that shit is loaded with calcium and magnesium carbonates, and there's the odd bacteria colony in it. Nothing hazardous or toxic, its just different. But your gut can't handle it because it isn't used to dealing with anything except the overly sterile crap you've been drinking out of your tap for years. And magnesium salts are effective laxatives unless you're accustomed to them. Bottled water is even worse because it is utterly devoid of anything. So you get the worst case of the shits you've had in years. You blame it on the water - and you're half right: it is different and your body can't handle it.
But if you drink it for a few days your gut gets used to it and your biome morphs to deal with it. After 3 days you're golden! Then you go home. You don't get the shits when you go home because there's nothing in that water to fuck with you: its sterile as a troon. But it doesn't taste as good as Aunt Sally's...
The dog's issues would similarly pass after a couple days, but dogs don't use toilets and no one wants to deal with that shit - literally.
Like I said in my response to CanIPlay2, the neighbor drinks bottled water herself all the time. She just didn't think about giving the dog bottled water, and now this happened.
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