It’s worth noting there are two definite types of Cocker Spaniel, one being used in the field as a working dog and therefore quite a bit lighter, and the other being a show dog which have quite a bit heavier and sturdier build. Cockers need to know who is the boss and occasionally need to be reminded of this because they are much happier dogs when they know their place in the pack and who to look up to when they need any sort of guidance and direction.