Their temperament is described as gentle, loyal and affectionate, but dignified and aloof with strangers. They can appear to be a sedate breed and enjoy curling up on the couch, eating and sleeping.
Disadvantages of owning a Clumber are said to be constant shedding; snoring; and drooling, particularly dogs with very droopy flews. They have a unique snort when happy, similar to a soft piglike grunt.
The breed has been used to hunt pheasant and partridge, in both small packs and alone. It is well-suited for work in upland hunting in dense cover, and although the Clumber is rather slow in the field compared to other spaniels, it is a quiet worker with a fine nose and good stamina. The broad muzzle of the breed allows it to retrieve a variety of game.