Took Chet and Lexi to woods to continue to help him learn proper social behaviour. 

Let her run and had Chet walking in heel to increase his self-control, giving him lots of verbal praise for maintaining heel. 

On letting him free he tried to engage improperly ignoring her cutoff signals at which times I would split and correct. 

Once I was unable to split and Lexi gave a correction herself which had a good effect due to the surprise it created.

By the time we returned he was starting to respect her cutoff signals more often than not, and was starting to direct more attention towards me. 

Even though he didn't go into fear attack mode he still has the obvious worry and stress when she gets close to me until he sees me pet her which seems to ease his stress immensely.