Any time you have a pup that has been thru a lot there are *always* vestiges of that for a long long time.
I never *ever* deny water ... however, I do **limit** it -- for example -- for a dog like this a lick bottle sometimes works grand ... OR ice, rather than just a bowl of water. But if it makes her obscess then nope -- her bowl becomes empty ... that's her problem.
Honestly -- before you do anything too structured, probably the very *first* thing on my list would be both a full urinalysis (not just a little one -- get the whole 9 yards so you uncover ANY possible problems) *and* a full blood panel.
I learned a TON with Tinkerbell. I could kick myself six different ways *now* for NOT doing a blood panel when she first got to Orlando. I coulda saved myselfl MONTHS of work (and her a whole lot of sore skin!) because her liver values were *just* off enough that the demodex wouldn't resolve.
There was nothing specifically that pointed to the liver (except, as you may recall, she got into chocolate at Christmas - "the Christmas of the Sparkle Poop"???? *sigh*) . BUT at this point my vets and I think it very likely that she may have had some off liver values way way back at the beginning. We know her breeding was nothing to brag about, and she'd been thru h-e-double-hockey-sticks.
WAS it just her shenanigans at Christmas that knocked the liver off? or ... not. I'll never know.
Now this pup isn't "sickly" but she's got some issues. (most do, frankly). So ... if you go do bloodwork and a urinalysis and she comes out spanking clean -- sooo??? You've got a darned good "baseline" for ANY future problem. You never EVER have to wonder "I wonder how long *this* has gone on?? -- you KNOW.
Frankly -- I'll never ever take another puppy again without a full blood panel and a urinalysis. If the urine is too alkalyne or too acid -- frankly knowing now helps avoid a ton of stuff. If everything looks grand then GREAT. We'll know later on if something is "high or low" because we've got a baseline.
We've all gotta do chemicals to a degree for heartworm prevention, fleas, ticks, etc. (particularly living in Texas and Flooor-daaa) and it's a given they're hard on the kidneys and liver. So the baseline will eventually come in handy.
Since she's a drinker -- you really need to know what the specific gravity is -- you don't want to find renal issues *later*.
Now -- ALL that said -- do you remember Pollyanna? My little abused pup (she couldn't walk because her abuser broke her back). She had been seriously starved. So much so that food of ANY sort literally caused her panic attacks. Particularly if she couldn't get TO it.
But ... once they discover the basic structure;
1. There WILL be food here -- more than once a day. It happens morning and night (and maybe 3 times since she's a wee one)
2. There is ROUTINE. this ... then this ... then Mom goes to the kitchen and we gotta "sit" ... and sit ... and SIT ....
And eventually you may have to sit there and STARE at the wall with your arms folded until things settle down ... then put the bowls down.
(This makes me remember teaching 5th grade and the days when I would just sit at my desk and start to count ... 1, 2, 3, ... until SOME bright light would say "Shhhhhh, she's COUNTING ... SHUT UP ... SHE WON"T STOP UNTIL WE"RE QUIET!!!!!" Some days I got to 3 ... some days I got t 103 ... ) I'm not advocating teaching your dog to count (they do that well enough sometimes *grin*) BUT ... you will arrive at things to promote peace (if you're patient ... and I think you are *smile*)
My point is ... structure is your friend.
3. Some days just let her experience new and wonderful things and flavors. It can honestly help elevate the panic from mere panic to joy. I so clearly remember the day i took all the dogs, with Polly, in the car just to go get ice cream. Just plain strawberry ice cream with strawberries on top.
Suddenly it wasn't just food ... this was ... *sigh* close to Nirvana for her. But she "got it" that this was just plain something done for JOY. Going out to something special .. everbuddy got some. Not lots ... just a liddle. But ... yep -- Foxy, then Socks ... then ME ... (even in this .. the routine).
You may never completely eradicate some of the panic and eagerness. I never was able to with Kee Shu (and she had been starved as well). But ... it wasn't panic. It became -- with her -- the observations of an old dog who suddenly wasn't terrified of reprisal for her to vocalized a bit over food.
With Kee it wasn't there to start with. Oh she'd "shake" and tremble ... but her vocalization didn't happen until she began to feel comfortable within the structure.
4. You will need to watch Gabby *carefully* as she begins to settle in and "belong". Because once she gets the least bit comfortable with her status in the pack she will likely try some resource guarding and you won't want to let that happen. Again -- structure will be your friend. You may not even see it until she hits that 'teenager' period where she's a bit "bigger than her britches" if that makes sense.
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If I can make one recommendation -- don't let her obsess -- don't let it become a habit. Because it can degenerate into a seizury type of state. It will likely seem like it's all you ever use "leave it" for -- but it will be important.
Poor gal -- it's scarey to imagine what they went thru to have it manifest like that. To be THAT thirsty. THAT hungry.