For something on the belly or back, you can probably dilute it with 1 part water to 1 part betadine.
If you ever have to treat a mouth infection and nothing else is available, you can dilute 5 parts water to 1 part betadine (it's not the best thing to use for mouth infections, but it can be used if there are no other options)
For sensitive areas like the mouth, Chlorhexidine diluted in 5 parts water to 1 part Chlorhexidine is less abrasive.
Thanks for everything. He has shed and spots are gone. He looks fine. He ate frozen mice. Everythink is good again thanks for your help.