While they are incredibly secure, untying the knot after use is quick and easy. If you need to secure rope to a carabiner, pole, or a similar object, the clove hitch is a reliable choice.
One of the most important safety procedures that one can do before climbing is tying into the rope and anchor system properly. The knot that is most commonly used for tying into a harness is the ...
For added security tie a safety knot by passing the finishing loop through the carabiner. Alternatively, clip a carabiner into the finishing loop and then clip this to something else (harness etc.) - ...
However, if simplicity is your style, you can simply tie a figure 8 knot into one end and attach a locking carabiner to the loop, where it will then clip onto your dogs harness or collar.