Stubborn chow

[JessB]

Hi my 4 month old chow Koda has been great so far. He goes to training once a week however on his walks at home on the way back he refuses to move and he jumps/grabs my arm/legs/ clothing. The trainer said to let him sit for a few moments to take in his surroundings which I do but then I do a count down 321 then pull his lead slightly but again all he does is go for me (he still has puppy teeth so it hurts).we walk for a while go to the park do training at the park sit/down/here and recall
Then he has free time to go explore but on the way back he’s a nightmare. Can anyone offer some advice/do all chows go through this stage?