Pup's do actually learn hand signals faster than voice signals...it's a ot of fun when you give the signal's and not using your voice...
Bambie has a just now learn the vice signal sit (she 7 months), but she knew the handsignal when she was 15 weeks...
And it's a lot of fun to see how smart the terrier is....for example hiding things and find a stick you touched and they know your smell from others....