As an addendum: 

I am actually pretty sure my dog really is fine and her refusal to eat the foods she associated with throwing up are what got her into this state.  That doesn't mean that as a 13.5 year old dog she will never have an intestinal blockage, or cancer, or diabetes, or dysfunctions of liver, kidney, pancreas,etc etc. and it doesn't mean that I should stop keeping an eye out when things like this happen -- it just means that I don't think that's what this is right now.   If I thought a damn thing else, I'd have taken her in on Friday or Saturday even if I had to drive my grandma with me to the dog's appointment - there's not much my grandma can do except kvetch bitterly and go along for the ride once she and her walker are loaded into the car in my keeping. And if I were upset enough to insist on it (I get deadly calm in a crisis but immoveable about deviating from best triage course of action -- I may be an emotional wreck before or afterward, but in a crisis I get calm and hyper focused on getting/finding the best knowledge to get the best outcomes as soon as possible.  So if I were implacable and serious about needing to take my dog in, my grandma wouldn't fight or be difficult about not wanting to go - she'd get all atwitter nervous overthinking anxious, wanting to learn about everything that's known and don and could be done and all the potential side effects of any medication course then wouldn't be able to even think about anything but the dog until she had news because that's how she handles stress - and then she'd likely get fierce about insisting I let her pay the vet bills for her own peace of mind as the only way she could think of in the moment to help me. Because that's how my grandma is in situations like that. Would have ruined her birthday though - so since my dog seemed as stable as possible and not in serious danger, I didn't even mention it to grandma though I did go check on the dogs first opportunity to hand off my grandma to others to help her settle in feel like she had some agency/control in setting up her new apartment.) 

But if I'd felt even the slightest intuition or doubt that my delaying could imperil my dog, I'd have taken her in even if there was only 24 he emergency vet open. She never got that bad, but I spent much of Thursday through Monday monitoring her closely, learning about what it could be and the various procedures/tests to determine, and following recommended actions unless specific factors showed up or worsened. She still may need blood work to rule out worst case scenarios, but for now getting her back regular on kibble is priority. But if I'd had any real fears she needed medical intervention, I'd have taken my pup in. I am pretty fierce about insisting other people I love take care of themselves even if I am the absolute worst about going in for myself, I've stoic-ed through fractured toes and ribs because I knew it wasn't displaced and precisely what they could/couldn't do other than x-ray confirmation and I definitely stood up and got back on my bike after the accident with the fire hydrant when I was 12 which missed my femoral artery by half a centimeter (a cut of the femoral artery will cause death by bleeding out in under 2 minutes) and massive hole in my right thigh big enough to put a softball or grapefruit in my leg that took 26 stitches only 15 external but damnit if I didn't get back on that bike feeling like I was good to bike back and I had my foot on the pedals ready to go when my camp counselor screamed at me to get off the bike and an EMT who lived across the street saw the whole thing came running over with tourniquet supplies after telling their spouse to call 911. So I mean, I'm stupid and stoic about my own pain and suffering and the best way to get me to take care of myself is to remind me I cause people who love me anxiety/pain if they worry I'm not taking care of myself - but for those I love I'm very fierce about getting them the best care possible that they need. If my dog got so dehydrated or malnourished or showed signs of a gi obstruction, she'd have been at the emergency vet with an IV for fluid replacement and scoped for any obstructions and then we'd start in on a blood panel to figure out if there was any imbalances or signs of cancer or organs failing. And if I couldn't swing it monetarily, I'd ask/let my parents help me out until I could repay them. That wasn't necessary, but it was always mentally among my triage options if she ever seemed like she needed it. 

Right now, she's stretched out taking a nap in her bed right next to me, using my left foot as her pillow and puppy dream twitching. She hasn't vomited since Sunday and she went out and had a more solid poop this afternoon (solid enough to pick up, unlike Sunday/Monday morning) and after we came in she was hungry so I gave her another half cup of the Royal Canin Digestive Care food. My cat has decided her new food smells so good that he thinks it's a treat and I see no problems with that. Cheaper than treats and potentially safer than the feline greenies if that's what has them sick -- if Spock wants me to give him individual pieces of the dog's kibble as a treat, alright. 

So I've been concerned about the dog monitoring her, but not actively worried yet. And the fact I got her to eat and not throw up some soft food, rice, and chickpeas yesterday was a huge relief. By last night my concerns had decreased enough to not be dominant in my mind unless she started vomiting again. And other than residual need to know if something I've fed her is making things worse, my concerns almost completely allayed after I learned this morning that there's a dog stomach bug going around the city. 

O yeah, in addition to me having a potentially toxic trait of me trying to stoic through any and all pain (not just mental distress or emotional heartache) there's something else about me you should notice from this story -- I didn't bring it up  until after my dog was doing better and I'd discussed it over with people at the vet office. I didn't mention even a word of it to anyone (except my parents who helped watch the dog during the time and knew she was having vomiting/diarrhea issues) while going through it.  I have a rather toxic trait of trying to endure and domy best while in the midst of things but I don't talk about it or me being upset by it until I'm starting to get a handle on it and things are settling out into the new pattern and I've done the hardest part of the work to accept the pattern that things have taken. Not just about what Britt did in the name of the entire band and how it thus affected my views of the moral compass of the band for not correcting the system of injustice created in their name and my acceptance that it meant me giving up something I have cherished and sought across lifetimes as being unavailable/unachievable in this lifetime since I see no way for me to have any place in his life given the central importance of his sister and his band in his life and to his self-identity. But I just wrestled it and kept on wrestling it until I'd accepted the inescapable logic of the consequences of her unacknowledged acts/choices and then afterward accepted that Eric didn't give a fuck about the wrongs he personally committed whenever he went live on the band's official instagram account that had a system of inequality now built into it, not even when you told him directly.

But anyway, stoic through it and not talk about it and crisis management to triage the best end results and avoid the worse is how I deal with things. I'm consciously trying to be better about sharing when things upset and hurt me and to ask for help/support (and also to talk about things before they settle into their patterns of consequences) but ingrained patterns of behavior are the hardest to break. 

But, all that said, at least my dog is on the mend and hasn't thrown up in 48 hours now and she's eating a new kind of kibble so whether it's the dog stomach virus going around or something I've been feeding her that was making her sick now she's older and her gi is sensitive. So I'm not as distracted by those concerns as I was.  If she gets worse again, then we'll do the blood draw panels to see if we can rule out the worst things or find a definitive answer of what it is.