tl; dr: se estiver marcado como spray de urso, vá em frente.
A Agência de Serviços de Fronteiras do Canadá lista esses requisitos para que o spray de urso seja permitido:
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:
(i) the label of the container indicates specifically that it is for use against animals only; and
(ii) the provisions of the Pest Control Products Act are met.
(iii) In order for a device or dispenser to be considered to meet the above criteria, it must be apparent that the device was designed exclusively for the control or use against animals. The manufacturer’s label and specifications will be deemed as the design of the product. The misuse of these or any other similar device may nonetheless be punishable under other laws.
(iv) Please note that there is no minimum quantity or capacity requirements (in terms of grams or milliliters) in making the determination with respect to animal repellents.