we;'ve had two dogs who both LOVED peranut butter - both would beg for it in the same way - by using the normal "begging" styles PLUS imitating the roof-of-mouth-licking motion they would undergo after receiving the PB.

(they were both convinced that if they raised their heads far enough and stuck their tongues out far enough they would be able to lick it off the roof of their mouths in one go.)