The ornamental design for a toyanimal for riding, as shown and described.
FIG. 1 is a front perspective view of a toy animal for riding;
FIG. 2 is a right side view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a rear perspective view thereof.
The broken line showing in the Figures represents portions of the toy animal for riding and forms no part of the claimed design. The area within the broken lines forms no part of the claimed design.