Drinking Trough

1. Drinking trough 2. Drinking trough Fig. 1 . 1 is a front elevation view of a drinking trough, in accordance with the present design; Fig. 1 . 2 is a back elevation view thereof; Fig. 1 . 3 is a left side elevation view thereof; Fig. 1 . 4 is a right side elevation view thereof; Fig. 1 . 5 is a bottom view thereof; Fig. 1 . 6 is a top plan view thereof; Fig. 1 . 7 is a perspective view thereof; Fig. 2 . 1 is a front elevation view of a drinking trough, according to a second embodiment; Fig. 2 . 2 is a back elevation view thereof; Fig. 2 . 3 is a left side elevation view thereof; FIG. 2 . 4 is a right side elevation view thereof; fig. 2 . 5 is a bottom view thereof; Fig. 2 . 6 is a top plan view thereof; and Fig. 2 . 7 is a perspective view thereof. The drinking trough is used to provide pets with drinking water.