Paw Plunger Medium Blue Paw Protector/cleaner for pets. The best way to clean the paws of your dog

How many muddy dogs could you do in one go before having to change the water? I have 6 dogs, for the car do I need 1,2 or 6!

I have a forty-ish pound border collie, would the medium be a suitable size for him?

Does anyone have a problem with unscrewing the lid? I feel the threads are too thin. I have a very hard time getting the lid off.

I have a 50 pound boxer/lab should i get medium or large?