the present invention will now be described in conjunction with the drawings , beginning with fig1 which shows an animal shelter 10 adapted for sheltering an animal such as a dog . shelter 10 is preferably constructed from plastic injection molded components which provide a sturdy yet lightweight construction which is resistant to deterioration from exposure to the outdoors . the shelter includes a front wall or entrance side 12 within which an arched entrance or opening 14 is formed during molding . front wall 12 is bordered on opposite sides by flat side walls 16 and 18 and opposed by a flat rear wall 22 ( fig5 ). a step 20 is molded along the bottom of opening 14 for providing added rigidity to the structure . side walls 16 and 18 include generally rectangular shaped lower portions 24 , 26 and trapezoidal shaped upper portions 28 , 30 which extend upwardly and join a flat deck - roof 32 . deck - roof 32 may be formed with a three - sided free standing railing or wall defining an enclosure 34 extending over the front wall and sidewalls and defining an opening 36 extending over the rear wall 22 . the front entrance 14 is bordered on opposite sides by a pair of vertically extending grooves or slide tracks 38 , 40 formed along the inner faces 42 , 44 of side walls 16 , 18 . a vertically sliding front door 46 in the form of an arched grill is mounted within slide tracks 38 , 40 with a free sliding fit . although door 46 is in the form of an arched grill , a plurality of different shaped interchangeable vertically sliding doors complimentary with and mountable within slide tracks 38 , 40 may be used . door 46 may be completely removed from the tracks 38 , 40 or fixed in a closed position for shipping . instead of a sliding door , a hinged door could be used , either detachably mounted or permanently mounted to the shelter 10 . one or more bowls or receptacles 48 , 50 are molded along the outer face 52 of the lower rectangular portion 24 of side wall 16 . bowls or receptacles 48 , 50 are provided for holding food and water for an animal . rather than place food and water directly within the receptacles , removable bowls may be provided which nest within the receptacles and can be removed for easy cleaning . because bowls 48 , 50 project outwardly from side wall 16 and rest on the ground , they add to the stability of shelter 10 by resisting tipping . additional stability may be provided by forming one or more foot pads 54 along the outer faces of side wall 16 , 18 , back wall 22 and / or front wall 12 , preferably at the corners . one or more drainage ports 56 may be formed at the bottom of side wall 16 for draining cleaning liquids from the interior of the shelter 10 . the floor 58 ( fig5 ) of the shelter is preferably slanted or banked downwardly toward the drainage holes 56 to allow for a complete and automatic elimination of cleaning water . although the drainage holes 56 may be formed along the bottom of any wall , it is preferable to form them toward the rear of the shelter so as to avoid the formation of mud or the deposition of dirt and debris directly in front of the front entrance 14 . as seen in fig2 one or each of the upper trapezoidal portions 28 , 30 of side walls 16 , 18 may be detachably mounted to the adjacent rectangular lower portions 24 , 26 by any suitable connection such as a tongue and groove connection or a projection formed on one side wall portion and a complementary recess formed on the other . the phantom line 60 in fig2 schematically represents a rectangular projection on upper trapezoidal portion 28 snugly fit within a complementary recess formed in the lower rectangular portion 24 . an additional releasable connection may be provided between the top of the inner faces of the trapezoidal portions 28 , 30 and the side end walls of deck - roof 32 . instead of a fully removable wall portion , a hinged wall portion in the nature of a trap door could be substituted for portions 28 , 30 with a hinge attached between lower portions 24 , 26 and the upper portions 28 , 30 . by removing the trapezoidal side wall portion 28 , such as by engaging and lifting along finger grip 62 , the interior of the shelter is fully accessable and may be easily hosed down and flushed out . moreover , the removable side wall portion allows for full visual inspection of the interior of the shelter as well as any animal located therein . a series of molded steps 64 is formed behind and leads up to the rear wall 22 as further shown in fig2 . steps 64 provide easy access to the deck - roof 32 which provides a safe and clean resting area . enclosure 34 forms a three - sided railing which provides security for a resting animal . in place of or combined with foot pads 54 , stake down tabs 66 may be formed at the bottom corners of steps 64 and adjacent the front corners 68 , 70 ( fig6 ) of side walls 16 , 18 . tabs 66 , which project outwardly from the shelter , include apertures 72 for receiving stakes 74 for securing the shelter 10 to the ground . in order to provide adequate cross ventilation through the interior of the shelter , a series of ventilation slots 76 is formed in each side wall 16 , 18 as further shown in fig2 . slots 76 may be molded into the side walls 16 , 18 and formed with downwardly sloping overhanging ridges 78 which project outwardly from the sidewalls . ridges 78 limit the amount of precipitation entering the interior of the shelter . slots 76 may also be formed in one or more of the vertical faces 80 of steps 66 for further cross ventilation . as shown in fig3 and 5 , a common , generally rectangular base 82 may be molded as a separate component of manufacture as detailed in fig5 and assembled to various different interchangeable roofs . for example , a generally domed roof 84 may be used with base 82 as seen in fig3 or a centrally ridged roof 86 may be used as seen in fig4 . in these embodiments , the roofs 84 , 86 may be cemented or otherwise permanently attached to base 82 . alternatively , an interengaged complementary friction fit may be used to allow free interchange of various roofs . a leash assembly 88 is shown in fig6 wherein a leash 90 is shown wrapped around a spool 92 mounted on stake 94 . the leash assembly 88 is secured to the shelter 10 by driving stake 94 through one of the apertures 72 of one of the stake down tabs 66 . in this manner , the shelter is also staked in place . the leash 90 may be limited in length to prevent tangles . for example , leash 90 may be limited in length to less than the length of the outside perimeter of the shelter and preferably less than the length of three sides of the shelter . it is possible to retractably mount leash 90 to spool 92 with a light coil spring mounting of the type commonly used with measuring tapes so as to further reduce leash tangling . the interior of the shelter 10 may be divided into two or more compartments 94 , 96 , 98 as shown in fig7 . base 82 is formed with internal grooves or slide tracks 100 which receive internal partitions 102 which may be in the form of an open grid as shown , or in the form of solid panels . directional arrow 104 shows the manner in which a partition 102 is inserted and removed from tracks 100 . compartments 94 , 96 , 98 provide separate chambers for separating two or more animals or for limiting the space provided to a single animal . as shown in fig3 and 5 , in other embodiments the animal shelter may be assembled to accept various interchangeable roofs 84 , 86 . similarly , as shown in fig8 interchangeable roofs 108 may be formed with internal grooves or slide tracks 110 which are designed to receive the vertically upward extending portion 114 of the internal partitions along the same axis as the internal groves or slide tracks formed in the base . there has been disclosed heretofore the best embodiment of the invention presently contemplated . however , it is to be understood that various changes and modifications may be made thereto without departing from the spirit of the invention .