of the cattle guard is generally dug corresponding to the depth of the form 110 to allow for leveled and convenient placement once the form 110 is placed in an optimal and desirable location a fillable medium is poured from the top into the form 110 and the form 110 and its contents or high density foam are simply left in the ground the end product is a cattle guard 130 as depicted in fig8 as illustrated in fig8 the resulting cattle guard 130 made in the form 110 comprises a series of horizontal parallel slabs 132 with at least the opposite ends 150 and 160 acting as a deterrent to cattle and other hoofed animals from passing across the cattle guard 130 each slab 132 is produced by pouring wet concrete or other settable amorphous medium into the channels 112 and compartment 120 of form unit 110 in situ the concrete preferably has a psi of about 5 000 referring to fig8 each slab 132 comprises proximal end 134 and distal end 136 a bottom 140 opposing sides 135 and 137 and a top 142 the slab 132 also comprises two opposing sides a front side 135 and a back side 137 preferably the sides 135 and 137 are upwardly convergent the series of slabs 132 are not overlapping in fact space 118 separates each slab 132 from the next as illustrated in fig8 the space 118 is preferably not large enough for a hoof of a hoofed animal to get completely through space 118 has downwardly convergent sides in that the width at the top is wider than the width at the bottom so that the hoof will not be able to reach the bottom of space 118.