Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
I'm sorry to hear that Roxy is not feeling well.
A young pup with these signs, would be suspected of having some possibly serious issues.
Parvo virus is easily prevented via vaccinations, but if Roxy hasn't had a full set of vaccinations yet, then she is still very much at risk.
Intestinal Parasites can also cause similar problems,
and perhaps most seriously, a blockage from ingestion of a foreign object, could cause these signs.
It can be very difficult to determine which of these is the cause, without a thorough physical exam, stool sample tests, and x-rays.
Unfortunately, it's very risky to attempt at-home care in situations like this,
as young puppies can rapidly decline in condition,
It is treatable, with aggressive intravenous fluid therapy and other treatments in the veterinary hospital setting.
without aggressive fluid therapy, death can occur due to severe dehydration
well, without having that done, you're limited to supportive care options, such as over-the-counter anti nausea medicines, etc, which may only worsen her overall situation.
generally, when a dog is vomiting and having diarrhea, is lethargic, and not playful, it's worrisome -- and cause for action.
If there is anything else I can do to be of assistance, please let me know.
if your'e not able to get her in,
you'll need to try to start fluid supplementation,
using a syringe or dropper,
with a 50-50 mix of water and pedialyte
or water and chicken broth
to help prevent dehydration.
you are very welcome.
best wishes to you both. :)