How much fluid are you giving? Is it fully absorbed before giving the next round? Three times a day is quite frequent...even when Trix was in advanced CKD, we only gave fluids twice a day. I’d be concerned about over hydration with giving fluids that frequently. Also, have other conditions been ruled out as a cause for the dehydration?
You absolutely need to use s new needle every time you give fluids. For one thing, one stick dose make the needle dull, which will worsen scarring and make the stick more painful. One of the stickies at top of the forum had pictures of what needles look like after use (sorry I can’t remember which sticky and I’m posting from my phone do hopping around is a pain).
For another thing, reusing s needle created opportunity for infection.