Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This sounds quite concerning for Molly. I am not sure if I can link the symptoms of the two dogs unless they both ate the same thing. For a dog of Molly's age this is a clear indication she needs to be seen by her veterinarian right away. She may be experiencing the vomiting/trembling from abdominal/stomach
The inability to walk could be due to many things ranging from severe pain leading to unwillingness to walk to weakness (such as can be from internal bleeding
or other causes of anemia or electrolyte problems) to spinal problem (such as trauma, slipped disc, infection, etc) to hind limb muscular problem. To try to narrow down that list is going to require she be examined by her veterinarian and then probably some testing that might include lab work (CBC, chemistry profile, urine check) and radiographs (X-rays).
The shaking could be due to pain or fever (temperature higher than 102.5F) or a true neurological problem, or possibly cold although being cold is quite rare.
I wish I had some easy at-home solution for you but in order to diagnose her and make effective/safe recommendations I too would need to perform a physical exam followed by some testing. Given the seriousness of her condition and that it is not improving for you, I must recommend you get her in to be seen as soon as possible today.
Until you have her seen, please keep her indoors and monitored. Make sure her water is available. I recommend not feeding
her more until she is examined given that she is vomiting.
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