Meanings of little cocker in English

Honor's lying on her bed, curled up with Baxter, the little cocker spaniel she found abandoned a few weeks back.

A dray-horse was standing before the mill gates, and frisking about its heels was a dandy little cocker spaniel, prettiest little dog you ever saw.

"You little cocker, you would have sold it twenty times, wouldn't you?"

"The little cocker is drunk or something."

"Look here, you little cocker!"