The ornamental design for a collar with leash, as shown and described.
FIG. 1 is a first perspective view of a collar with leash showing my new design, shown in a fastened condition;
FIG. 2 is a close-up front view of the collar with female buckle receiver portion of the invention shown with the leash band with male connector element removed;
FIG. 3 is a first close-up side view of the collar with female buckle receiver portion of the invention shown with the leash band portion shown broken away on the left side;
FIG. 4 is a second close-up side view of the collar with female buckle receiver portion of the invention shown with the leash band portion shown broken away on the right side;
FIG. 5 is a top view of the collar with female buckle receiver portion of the invention shown with the leash band portion shown just cut away at the seam of the leash belt portion;
FIG. 6 is a rear close-up view of the collar portion of the invention shown with the leash band part removed; and,
FIG. 7 is a second perspective view of the collar with leash shown in an unfastened condition.
The stitching lines are not claimed. The remaining portions depicted in broken line are also not claimed.