He may just not like to use a soiled pad!
Lady is like that. She'll sniff and snort and run backwards if her pad is wet. I have to change it after each use.
Has he already started to lift his leg? If he has, he won't start to squat now. You can make him a "target" for his pad. I know people fill milk jugs, etc. with sand or kitty litter to weight them down, then wrap a pad around them. I think they even sell little fire hydrants for that purpose.