On categories - there are some that are available in the US that may not be available in Canada.
For the sake of example (but may not be true in real-world) - Canada may have Pediatric Surgeon and the US may only have a Pediatrician. Or the US may have Cat Hostel but Canada doesn't have.
There are also categories that have the same use but shown in different terms in both countries. Again, just for the sake of example: the US may have a Law Firm and Canada may have a Law Practitioner.
As for the attribute, it's these:
I could be wrong and maybe because of the main category you selected - but I remember seeing it here in the forum or some article that there are some attributes available in US and UK that may not be available in Canada.