The ornamental design for a combined dogcollar and leash, as shown and described.
FIG. 1 is a top, left rear perspective view of a combined dog collar and leash showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top, left rear perspective view thereof in an exploded condition.
The broken line showing of a section of the leash is included for the purpose of illustrating a part of the combined dog collar and leash that forms no part of the claimed design.