The ornamental design for a dinosaurinflatablefountain, as shown and described.
FIG. 1 is a first perspective view of a dinosaur inflatable fountain showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is an enlarged view of the selected portion in FIG. 1; and,
FIG. 10 is an enlarged view of the selected portion in FIG. 1.
The broken lines shown in the drawings depict portions of the dinosaur inflatable fountain in which the design is embodied that faun no part of the claimed design.