Final answer:
Cocker spaniels, golden retrievers, and labradors differ from poodles in that they possess unique characteristics, leading to mixed breeds like the cockapoo when crossbred with poodles.
Step-by-step explanation:
Based on the information provided in the passage, it can be understood that cocker spaniels, golden retrievers, and labradors are different from poodles in that they are all likely to have distinct physical characteristics and possibly different behavioral traits. When a poodle is bred with another breed, such as a cocker spaniel, the result is a mixed breed or 'designer dog' such as a cockapoo. This suggests that poodles may have certain attributes that, when combined with those of other breeds, result in a desirable mix of traits found in offsprings like the cockapoo.