Interesting. Well he is a puppy and he may be going through a phase. Teach him the QUIET or ENOUGH command. Does he like squeaky toys? (I have never tried this) But after mine disembowel their stuffed toys, to get the squeaker, I relieve them of this kool little object. It is like a tiny balloon in your pocket that you can squeeze for instant attention. Sometimes getting your dog's attention back on you, makes sense. Instead of telling him No! or Quiet! or Enough! Try squeaking the squeaker and when he looks at you, start playing with him and then give him a sit command, praise, down command, good boy, Sit, then a quick trick high five, PARTY TIME!!! Then try continuing your walk.
Who knows. It may not work, but it might be fun to try it.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC