dog sick

Did the vet tell you not to give water??  Typically you don't deny them water because hydration is so critical, and a shot of reglan (or whatever for nausea) doesn't last long. 
 
Are you feeding her what she's used to eating?  She could be depressed but keeping her eating is SO important. 
 
Is your friend available by phone?  When I leave MY dog with someone I *want* them to phone me if there is a problem -- but I wouldn't allow the dog to go all weekend without eating anything. 
 
Is it her regular vet you are taking her to? 
 
It's difficult because this could simply be caused by the dog feeling despondant over the owner being gone.  (and do try to be careful not to be overly 'concerned' -- they can be quite the emotional sponges and soak up all the wrong emotional vibes -- what to us seems like commiseration to them becomes "OH GOSH I'M DYING!!!!" and they get 'worse' than they actually are.
 
I wouldn't automatically assume what an emergency vet would do -- but I would have thot a blood panel would have been done to see what was going on there.  Often x-rays don't show much -- but will show if there is a 'blockage' -- is the dog pooping normally (given that it hasn't eaten much in two days)? 
 
Some dogs wouldn't EAT cottage cheese or plain rice -- has she any interest in regular food? 
 
This may sound silly -- but when she threw up was it stuff she'd eaten hours and hours ago and it was still totally undigested, or was it more like she ate and threw up promptly what she'd just eaten??  Such stuff can be more telling than you'd think.
 
The other thing I would have thot the vet would have done a fecal to see if there was any parasites (sometimes that can happen JUST from stress).  But you are wise to not just let it go -- it's scarey to have charge of someone else's dog and have it sicken.  If the dog continues to get worse you'll have to take her in.
 
If you lift her lip above her canine tooth -- does the gum appear pink and healthy or really really pale?  If you press the tip of your finger into that gum and then release -- does the color go back quickly or is it slow (like 2-3 seconds) before it comes back?  That's called 'capillary refill' and it's always a good "first aid" type of test to help determine how ill the dog is.

Thank you so much for the reply. The vet told me yesterday not to let her drink at all (that was odd in my opinion since she was looking for water). Now she does not want to drink anymore. I see this as a worsening sign. The vet did not do any fecal tests either.
I do not think she is faking the sickness since i look after her quite often and she loves being at my house with my chihuahua dog. She was in a lot of pain yesterday since she was crying and could not get confortable at all.
I took her out to the restroom 10 mins ago and she threw up green stuff. (is this a bad sign?)
I tried to call my friends numerious times. They have switched their phone off.
I checked her gum and it seems pink enough. When i press it it does not stay white for long.
Right now she does not cry anynore; but she seems week and she does not want to touch food.
I have fed her on natural scince diet but at home she is eating almost all the time cat food (she seems to prefer it to her own food since she lives with 4 cats).
If she is not eating at all for the rest of the day, do you suggest taking her in ?
Thank you again for the replies.

I forgot to tell you that when she threw up after she ate it was all digested remains and after she did not eat much her vomit was watery.
I did not take her to the normal vet since i dont know where my friends take her. I called about 3 vets in the area and none have got her on the books. So i took her to my vets.

Why no water?!?!  Did the vet give you a reason?  I have never heard of that.  Pull up the skin on the back of her neck.  If it doesn't go down immediately, she is dehydrated.  I would take her to a different vet personally.  I would also strongly suggest that her owners stop her from eating the cat food.  It is very bad for her.  Dogs can process that much protein very well and its hard on their digestive system. 
 

I have taken sam to the 24 emergency vet last night. They did blood tests; good news is that she does not have pancreatis, but she has acute gastroenteritis. Blood tests came back ok. But her tummy is very sore. They gave her fluids intraveins, electrolute and lipase to replace the nutrients she lost. She is on a 10 day flagyl medication and she also received buprenex to ease her pain. I thought she would get better but after I got back from the emergency vet she threw up everything they gave her and pooped blood. I called them back and they told me to keep an eye on her and to give her the antibiotics today 2x day. Even if she is not eating, they said that the antibiotics should kick in tonight at the latest. If she is not improving my tomorrow she may need to go in again for fluids.
What an experince poor Sam and I.

I am waiting by the phone for her owner's return. I am dreading it.

Will let you know how it goes.
PS: I will definitely tell them to stop feeding her cat food. They said she needs a very low fat diet from now on.

Stress alone can trigger that -- but yeah, cats are obligate carnivores and dogs aren't. Dogs love that high protein cat food (and that's why they like cat 'tootsie rolls' because it's most all protein waste too) BUT it's not good for them. 
 
Flagyl is a unique antibiotic -- it kills gut bacteria (they give it for several kinds of parasites) BUT it also is an anti-inflammatory for the gut.  You might also try giving some chammomile tea -- just the stuff from the grocery store is FINE -- brew it like tea, and add the herbs to her food. 
 
You might want to try rice and hamburger (about 3-4 cups of cooked rice to about 1/4# of raw hamburger added to the last couple of minutes of cooking time so the meat isn't over-cooked but it flavors the rice.  That's a pretty bland diet that will be easy on the gut.  You can add a LITTLE garlic powder (not garlic salt -- just garlic powder).  Take the soggy herbs left over from the tea and add and mix right in. 
 
Get one of those little kid medicine syringes.  (in the baby aisle of the grocery store) Suck up the tea and hold Sam's chin up ... mouth mostly closed.  Put the tip of the syringe right behind her big canine tooth and squirt gently and the liquid will go in her mouth slowly enough so she can swallow.   That will also actually help heal and soothe the gut.  Chammomile is also a very mild anti-inflammatory (it's an NSAID that won't upset the stomach -- in fact, quite the contrary - it's an herb that's been used for centuries to settle the gut).
 
You passed this "doggie sitter test" with flying colors.  Honestly?  I just WISH I had someone that good to leave my crew with!!!  Your good judgement in taking the dog to the e-vet not once but CALLING again ... you are a very GOOD friend.  Bless you!!!
 
Pancreatitis is scarey stuff -- the fact that you took her in quick probably saved her life.  But it sounds to me like the vet thot she was close TO it and the pancreas may, in fact, be inflamed.  That diet I gave you (the rice/cooked burger) is the one MY vet gave me for my dog 30 years ago when she had pancreatitis.  I almost lost her twice to it -- and if they are giving canned cat food trust me -- they're setting themselves up to lose her.  Too fatty, too high protein -- too hard on the pancreas and kidneys both.
 
Good job, eller!!  Don't let them give YOU a hard time -- you did well!!!

For all those who have been so kind to email me with advise, thank you again.
Unfortunately throughout the day yesterday Sam stopped walking,, threw blood and she was in agony. I took her to the Emergency Animal Hospital again. They put her on fluids and pain meds.
When my friends came back they told me that on monday Sam ate (my mistake) some rancid beef meat that they threw away. Sam always loved food and always loved to sneak into into places and eat all she could find.
Should my friends told me on wed that she ate bad food, i could have told the vet that and he may have pumped out her stomach and saved her...
But sadly she passed away.
I am heartbroken; Sam was like my own and I cannot believe that she will never be around to wagg her tail and welcome me at her house.
I just wish I could have done more.

xxx[]

Oh no, what a sad ending to this.  I am so sorry......you did everything right, though.

I'm so sorry to hear this.
 
Run free Sam.

I am sorry for the loss of your friend Sam.  You did the very best you could to help her.
 
{{hugs}}
 
Run free, Sam.[sm=angel.gif]

Yes, you did all your could and you went above and beyond what a normal pet sitter would.  What a true friend and dog lover you are.
 
I am sorry to hear about Sam.  If your fiends get another dog tell them DO NOT FEED it cat food. 

I am so sorry. You did all that you could though, there was nothing more to help her.
My thoughts are with you.

I am SO sorry -- what a horrible thing to have happen after you tried SO hard.  If she ate tainted beef she probably had a severe infection and without proper diagnosis it ran unchecked.  Likely it was in the liver -- I had a similar thing happen to my dog and had I not been SURE of what was going on it would have been very difficult to diagnose.  Bless her heart -- at least she had someone truly caring to look after her in you!