My 2 jack russells like to bark too esp at night b'cause they sleep outdoor and will bark at anything that moves. We have decided to use muzzle to stop their barkings at night and keep them in cage. The female puppy is quiet but the male puppy still can bark with the muzzle on. We put a cloth on the front of the cage to prevent him looking outside of the house. Since then, the barking is lessen. Maybe u can try this.

Worse come to worse, you can try citronella anti bark collar. This is how the collar functions based on a website i've read "When your dog barks, the collar sprays a mist of citronella scent in front of his nose. Dogs don't like this. The hissing noise startles them and they dislike the citronella smell. Most dogs figure things out very quickly and stop barking. "

I have enquired with the vet and they said this collar can only be purchased online.

Noted ur concern. However my dogs can still stick out their tongue to drink.