Akari:
I am not positve, maybe someone else will have more info, but yes I would use anything that was left over later that day. I would not mix more than what I would use in a day. I believe Dr. Becker recommended applying 2x/day. Maybe mix it in an old plastic container that has a lid in case you do have some product left. I also think you will get pretty good at pouring out the quantity you need to pat & dab onto to him each time without wasting any. For a little guy like Bentley this application will not take much product at all, especially since it will be diluted.
When I use it on my horses I put it in different applicators. Sometimes it is in a spray bottle, sometimes it is in a plunger (needle without the syringe attached). Usually there is product left over and I just put it in my medicine case to use later.
