104 includes a forward feeding portion 106 connected by a ramp 108 to a rear container mounting portion 110 fig2 is a side perspective view of container 102 container 102 has spaced side walls 112 a rear wall 114 and a sloping front wall 116 container 102 also has a handle 118 for ease of carrying and a base portion having a circular discharge opening 120 dry flowable pet food is packaged in container 102 at a pet food production facility a closure or other seal not shown such as a flexible foil sheet is attached to the periphery of circular discharge opening 120 with a peelable adhesive to seal the pet food in container 102 fig3 is a perspective view of a pet food dispenser adapter 300 configured to adapt container 102 for mounting on tray 104 adapter 300 permits any pet food container having a circular discharge opening of an appropriate diameter to be mounted on tray 104 adapter 300 includes a base 302 and a circular opening 304 configured to cooperate with discharge opening 120 of container 102 a circular flange 306 extends from base 302 at a periphery of opening 304 flange 306 is configured to insert into discharge opening 120 of container 102 and hold adapter 300 in place through the action of frictional force between flange 306 and rim of opening 120 grooves 308 extend along each of two opposed lateral sides of base 302 a projection 310 projects into each groove 308 adapter 300 also includes a pair of parallel stabilizing flanges 312 each flange 312 extends from opposed lateral sides of base 302 stabilizing.