Possible Clues:

• One in a litter basket, perhaps
• Inexperienced one
• Young beagle
• Pick of the litter, at times
• White-furred seal, perhaps
• New Newf, e.g.
• The little beast gets sick, by the sound of it, at school
• 3-Down, e.g.
• Obama's Bo, e.g.
• Litter yipper