My Australian shepherd gets the zoomies when allowed to run outside.
He loves it even more if he can find everything waterbody to make the biggest of splashes.
Needless to say during the wet months of the year he gets dirty a lot.

Normal showerheads are unable to properly reach his undercoat to rinse out soap and dirt.
To solve this I've created a showerhead with a
1/2'' thread that can do the job by focusing the shower pressure into a single stream.
And having tested it on myself and our doggie I'm happy to say it not only cuts the shower time in half but our dog also seems to love the increased rising feeling.

One simply screws on and uses the water tap to regulate the showerheads pressure.
Always make sure there's just enough pressure to get in your dog's coat without hurting it by checking it on your arm!
Ofcourse as with any new things start with a low pressure to let your dog get used to the feeling of a concentrated stream.

I've included a version with a tighter gap to allow for adequate water pressure even in houses with lower water pressure.