So, it sounds like we can relax – he’ll drink before he does himself harm.
For some more background, he’s about thirteen and a half (the older brother is about fifteen or so). They were both at the vets within the past couple of months, and both had bloodwork done (it all came back without a problem).
Unfortunately, switching to a moist food isn’t much of an option, as they’re on the senior dry food our vet recommended. (Plus they’ve been free-fed all their lives, so changing out to scheduled feedings would be a bit over the top.) The chicken-waterer is the first thing that looks like a second viable alternative if this doesn’t work out – thanks for the link!
We work out of our home, so they’re constantly with us – we’re absolutely sure there’s no other water source he can get to. Due to other pooch-related management (er, pooch-related insanity), his movement is actually controlled 24-hours a day. During the day he’s gated in the office/den/wherever with us, during the night (or whenever we can’t keep an eye on him) he’s in his crate.
Also, we made the conscious choice to wait until the fall to make the switch so overheating isn’t a problem.
Anyway, thanks for the reassurances. Between yesterday and today, he’s taken a few swigs, finally doing so voluntarily and on his own (as in, he just walks up and takes some without us pointing or cajoling him), but it’s still not enough to keep him fully hydrated.
It’s been quite disconcerting to see him so clearly uncomfortable, but the gist of this thread has been whether or not he’ll actually hurt himself. We fully recognize the dog-training-us possibility, and are prepared to persevere until he fully gets it, but not if we were taking undue risks. It seems like no, he’ll suffer some, but not come to harm.
Now, about training the cats…