Actually Oda just wanks Sanji hard this chapter.
Before this chapter, Sanji is always that trash bastard, womanizer, creepy pervert, weakling, kidnapped kid, damsel, crybaby, traitor who kicked his own captain, psychopath who served razor for crewmate but served cake for Big Mom, a punching bag and a hypetool in every arc.
But now Oda elevates him hard by comparing him with a dog.
A dog is supposed to be the loyal partner, man's best friend, people even call dogs as the wingless angel.
So yep, comparing him to a dog, today must be the best day for Sanji in whole 2023.