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Pets are made to serve orally, for intensive training I always recommend denying her food or water for a day or so, give her a little water the next day, but make her drink it from a bowl, or pour it directly in her mouth in small increments, make sure that the dildo is between her lips at all times otherwise.
Continue this for as long as needed, and the warm burst of cum down her throat- being the first food of any sort for some time- will be welcomed, greedily swallowed, begged for again.
Condition your pet in this way often, and I promise they will be perky and obedient little sluts.