all views described below refer to the drivers ( left ) side of a vehicle as viewed from outside and from an abeam position relative to said vehicle . the terms forward and aft are relative to the vehicle and would remain accurate for a pet window installed on the passenger ( right ) side of a vehicle . fig1 depicts a typical passenger vehicle and window section ( 1 ) and typical location of a pet window ( 2 ). fig2 depicts a typical pickup truck and associated truck cap with a window section ( 1 ) and typical location of a pet window ( 2 ). fig3 depicts a round piece of glass which functions as a plug ( 10 ) insert herein referred to as the plug ( 10 ) sized to fit into a round opening ( 17 ) manufactured into the window section ( 1 ). the plug ( 10 ) will consist of the same characteristics in thickness , contour and tint as the window section ( 1 ) to which it will be placed . the plug ( 10 ) viewed from the outside of the window section ( 1 ) having an anchor pin assembly located at the 9 o &# 39 ; clock ( forward ) position and a cam lock located at the 3 o &# 39 ; clock ( rearward ) position . the anchor pin assembly ( 11 ) is mounted on the interior side of the plug so as to enable the anchor pins insertion into the anchor points of the interior flange located at the 9 o &# 39 ; clock ( forward ) position of the opening ( 17 ). in this embodiment the anchor pin assembly ( 11 ) is mounted using bolts through pre - drilled holes in the plug ( 10 ). an alternative method is to glue the anchor pin assembly ( 11 ) to the plug ( 10 ). the cam lock ( 14 ) shall be located to enable its locking arm to engage the slot of the interior flange at the 3 o &# 39 ; clock position of the opening ( 17 ). the cam lock ( 14 ) is mounted to the plug ( 10 ) in accordance with the instructions given by the lock manufacturer . the opening shall be fitted with molding around its circumference . fig6 . ( 3 ) and ( 4 ) represent a design for a molding ( 3 ) that satisfies the requirements set forth in this paragraph . the molding ( 3 ) is attached to the circumference of the opening ( 17 ) using appropriate glue . the molding ( 3 ) will be designed such that when the plug ( 10 ) is in the closed and seated position within the opening ( 17 ) the plugs ( 10 ) elevation is the same as the elevation of the window section ( 1 ) to which it is being inserted and thereby flush . the molding ( 3 ) will permit the plug ( 10 ) to fit in a secure and sealed manner so as to prevent moisture and exterior elements from entering the vehicle when the plug ( 10 ) is in the closed position . the molding ( 3 ) will incorporate the appropriate materials and be of such design to facilitate closing and locking the plug ( 10 ) in place within the opening ( 17 ). the molding ( 3 ) being designed with an interior flange ( 4 ) which when viewed from the outside of window section ( 1 ) will have at its 9 o &# 39 ; clock ( forward ) position two holes serving as anchor points ( 5 ) to receive the anchor pins ( 13 ). the interior flange ( 4 ) will have at its 3 o &# 39 ; clock ( rearward ) position a slot ( 9 ) to accept the locking arm ( 16 ) thereby locking the plug ( 10 ) in place within opening ( 17 ). the above description as it relates specifically to attachment points and locking mechanism at the forward and rearward position of the plug ( 10 ) and opening ( 17 ) is but one embodiment for the purpose of making said pet window functional and is meant to describe a good and practical way of opening and closing the same . the above described pet window is easily opened and closed . to open simply insert a key into the key slot and rotate key to the unlocked position . this action will disengage the locking arm ( 16 ) from the slot ( 9 ) of the interior flange ( 4 ) and allow for the removal of the plug ( 10 ) from its opening ( 17 ). the plug ( 10 ) may then be placed into a pouch and stored inside the vehicle at a convenient location . to close simply remove the plug ( 10 ) from its holding pouch and replace into the opening ( 17 ) by first inserting the anchor pins ( 13 ) into the anchor points ( 5 ) of the interior flange ( 4 ) and then positioning the plug ( 10 ) into the closed and seated position . insert key into the key slot ( 15 ) and rotate key to the locked position . the best mode of carrying out this invention is during the original manufacturer of the window section ( 1 ) or its replacement . the opening ( 17 ) diameter will be appropriate to the size of the pet . the opening ( 17 ) shall be placed in the appropriate location of the window section ( 1 ) considering structural integrity and height requirements to enable its use by the pet . the window section ( 1 ) having been designed to fit a particular make and model of vehicle or vehicle accessory both in shape and contour needs only to have the opening ( 17 ) cut into place . the resulting round piece of glass can then be used to manufacture the plug ( 10 ) itself , thereby having the same qualities in thickness , shape , contour and tint as the window section ( 1 ) from which the plug ( 10 ) came . an alternative method would be to simply match said qualities of the window section ( 1 ) in the production of the plug ( 1 ) from a separate piece of glass stock . the molding ( 3 ) would then be installed about the circumference of the opening ( 17 ). the anchor pin assembly ( 11 ) and cam lock ( 14 ) would then be mounted to the plug ( 10 ). the processes for producing the plug ( 10 ) and opening ( 17 ) shall be cut and made in the same manner as with the manufacture of the window section ( 1 ) itself using current industry standards of machinery , technique and tooling as it applies to vehicle glass . this includes tempered glass and safety glass .