The ornamental design for a transmitter of dogtrainingcollar, as shown and described.
1. Transmitter of dog training collar
1.1: Perspective
1.2: Front
1.3: Back
1.4: Top
1.5: Bottom
1.6: Left
1.7: Right
Fig. 1.1is a perspective view of the transmitter of dog training collar; fig. 1.2is a front view thereof; fig. 1.3is a rear view thereof; fig. 1.4is a top view thereof; fig. 1.5is a bottom view thereof; fig. 1.6is a left view thereof; fig. 1.7is a right view thereof; The broken lines in the drawings depict portions of the transmitter of dog training collar that form no part of the claimed design.