Any locality may by ordinance prohibit the running at large of all or any category of dogs, except dogs used for hunting, in all or any designated portion of such locality during such months as it may designate. Any such locality may also require that dogs be confined, restricted, or penned up during such periods. For the purpose of this section, a dog shall be deemed to run at large while roaming or running off the property of its owner or custodian and not under its owner’s or custodian’s immediate control. Any person who permits his dog to run at large or remain unconfined, unrestricted, or not penned up shall be deemed to have violated an ordinance adopted pursuant to the provisions of this section. Such ordinance shall provide that the owner or custodian of any dog found running at large in a pack shall be subject to a civil penalty in an amount established by the locality not to exceed $100 per dog so found. For the purpose of such ordinance, a dog shall be deemed to be running at large in a pack if it is running at large in the company of one or more other dogs that are also running at large. Any civil penalty collected pursuant to such ordinance shall be deposited by the treasurer of the locality pursuant to the provisions of § 3.2-6534.