Went back to the vet with Jabu yesterday, as he continued to vomit. She gave him a Stemetil
injection and put him on another drip.
The reason why she has not given him SubQ fluids is because he does not have enough loose skin. Also he is quite a big boy(he was 30kg last week - now 28.5kg), so he would need a lot of it to actually make a difference.
After the injection, he managed to keep down supper.