Thanks Helen, yes that was Kiwi, although she hasn't trembled since and we've met several other dogs out on walks in the last few days (big and small) and she's been fine with all of them, so I'm not sure what it was about that other dog!!
She is the most "alert" of the pair, always scanning the horizon when out whereas Lilly watches you all the time, so she could be anxious, although she's snoring on the sofa at the mo!
They have both dropped the same amount of weight though and Lilly is definitely more chilled out
I went back to the pet supplies and they didn't have skinners (although can get it ordered), so I have taken his recommendation and got a small bag of Simpsons Premium 45% lamb to try, and some raw tripe

Will see if any improvement after I have gradually swapped onto that, otherwise will order in some skinners
