This is a very eye-opening article shared by Cow Mau’s vet: https://envisionhospice.com/considering-iv-hydration-for-your-loved-one-heres-what-you-need-to-know/
Please do take your time to read it through if you are in the position to give palliative care to your animals or humans. It talks about the pros and cons of IV-fluids for end-of-life care.