I was lucky my vet was quite happy for me to give Suzie fluids. Suzie had 80ml each day, at first I started with 40ml each side, but found it was ok to give the 80 ml in one spot - in fact you can give up to 100ml in one spot with no problems. It was much easier to just do the one injection, and Suzie was much happier with that, although she was a very good patient anyway. I got a narrow tube from my vet that fixed to the needle and the end of the syringe and that helped too, because if they move slightly when you are syringng its hard to keep the needle in place, with the tube it gives you a bit more flexibility.