My dog walks unsteadily and is listless; had two days of IV fluids, sometimes energetic sometimes not

There are many causes of whole-body weakness and low spirits, and a vet must examine the dog in detail to find the specific cause and treat it. Otherwise you can only maintain strength with IV fluids, but these are usually saline or glucose that treat the symptom, not the root.

You can also send the dog’s medical history, exam reports, and results so the vet can analyze the cause of the weakness and help your dog recover better.