This may help ... it' a bit ''legal jargon'', but I think it has what you need...
Fences and Detention of Stray Livestock Act
STRAY LIVESTOCK
Detention and sale of stray livestock
9 (1) Whenever any livestock strays onto the lands of a person and the ownership of the livestock is unknown, such person may detain the livestock.
(2) If not claimed by the owner within forty-eight hours, a person detaining stray livestock shall forthwith transmit to the municipal clerk an adequate description of the livestock that will enable the owner to recognize it together with an indication of the time and place of finding and the place where the livestock is detained.
The whole lot here
http://www.gov.ns.ca/legislature/legc/statutes /fences_d.htm