wall panel 34 can then be secured within the channel 20 of the base frame element 12 using any conventional means including through the use of tacks glue nails screws velcro u00ae type connectors or the like importantly the tunnel connection panel 36 can be placed in any position or configuration up or down substituting for a regular wall panel 34 in accordance with the invention accordingly a user can place the tunnel as need to fit the placement and configuration of the pet enclosure 10 in connection with the dwelling the various components of the modular pet enclosure are preferably constructed of a durable weather resistant material such material preferably comprises wood metal or plastic and is most preferably a plastic in a preferred embodiment the components are manufactured as extruded plastics most preferably polymeric plastics such as polyurethane or polyethylene by employing polymeric plastics the walls of the pet enclosure 10 can be constructed of transparent translucent or opaque materials to control light penetration and viewing as needed in an especially preferred embodiment the components are extrusion formed as readily known in the art from uv chemical resistant and environmentally compliant plastics such as polygal u00ae intepro u00ae or coroplast u00ae referring now to fig5 illustrating a cross sectional view taken along a sectional line through a preferred embodiment of a modular pet enclosure 10 according to the present invention the base frame element 12 includes a mesh floor 24 molded therein and telescoping adjustable legs 28 extending through the floor 24 and held in firm.