1)Mark Crispin's page from archive.org is great, but keep in mind it isn't being maintained if the law has changed.
2)On taking bear spray into Canada, the US CPB:
https://help.cbp.gov/app/answers/detail/a_id/878/~/want-to-bring-bear-spray-into-the-u.s.
references the Canadian pub:
http://cbsa-asfc.gc.ca/publications/dm-md/d19/d19-13-2-eng.pdf
which on p. 11 says:
"Exception: Aerosol or similar dispensers that contain substances capable
of repelling or subduing animals (e.g. dog or bear repellent) are not considered
prohibited weapons if:..."
(my summary from a very quick skim is that what matters is labeling)
Anecdotally, I frequently hear people advising that just buying bear spray in the first sporting goods store north of the border prevents any confusion.
2)On taking bear spray into Canada, the US CPB:
https://help.cbp.gov/app/answers/detail/a_id/878/~/want-to-bring-bear-spray-into-the-u.s.
references the Canadian pub:
http://cbsa-asfc.gc.ca/publications/dm-md/d19/d19-13-2-eng.pdf
which on p. 11 says:
"Exception: Aerosol or similar dispensers that contain substances capable
of repelling or subduing animals (e.g. dog or bear repellent) are not considered
prohibited weapons if:..."
(my summary from a very quick skim is that what matters is labeling)
Anecdotally, I frequently hear people advising that just buying bear spray in the first sporting goods store north of the border prevents any confusion.