All cats and dogs over three months of age and residing in Calgary must be licensed with The City of Calgary. If you do not license your cat or dog, you could face a $250 fine.
For more information visit: http://www.calgary.ca/CSPS/ABS/Pages/Animal-Services/Licensing-cat-dog.aspx

Impounded cats and dogs are animals sheltered at the Animal Service Centre because they were running at large in their communities, a violation under the Responsible Pet Ownership Bylaw. A cat or dog running at large creates safety issues for the public and for the animal. For more information please visit: http://www.calgary.ca/CSPS/ABS/Pages/Animal-Services/Impounded-cats-dogs.aspx