Also my opinion, but I don't think that at 2.5 years, the neutering will make the leg-hiking go away.
On the question about how it'll impact your two that squat (side note: lucky you!! I wish Scottie squats - I've only seen him do it twice and it was SO cute), the short answer is: it depends.
I was worried about allowing Casie to pee indoors on the potty pad (because for whatever reason she physically could not hold her pee while I am away at work), and that it would impact how Scottie only potties outdoors. Maybe I was lucky, Scottie knows she pees indoors. He smells her potty pad. But he never once hiked his leg up at home, not once.
I guess in your case, you may need to do a whole potty training from scratch with the new boy (God bless you for wanting to adopt him). Monitor them all closely and hope for the best! Worst case, maybe you could get the new boy a belly band?
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