Possible Clues:

• Treat for a dog
• Source of much canine delight
• *It makes a dog happy (Theme hint: Note three letters in each starred clue's answer)
• Show of puppy love?
• Doggy treat
• Treat for a terrier
• Treat for Fido
• Activity a puppy loves
• Terrier treat
• Affectionate gesture to a pooch