Amazon.com : TOHAO Beware of Dog Sign, 3 Pack 10"x 7" Rust Free .04" Aluminum Warning Signs, UV Protected, Reflective & Waterproof, Easy to Mount- Indoor Or Outdoor Use : Patio, Lawn & Garden

HIGHLY VISIBLE: Red , black, and white Beware of Dog Sign is sure to catch the attention of possible intruders.
DURABLE MATERIAL: 10 x 7 inches made of strong .04" aluminum, Unlike steel, These signs will not rust, so you can use them for a long time to come.
UV COATING PRINTED: The surface has a good reflective effect, graphics and paint will withstand the outdoor elements and will not fade,outdoor service life up to 7 years.
EASY TO INSTALL: Beware of dog signs has 4 pre-drilled holes for easy installation and can be mounted on any surface.
WIDELY USED: Suitable for courtyards, warehouses, private residences, and other places with dog activities.