Oh, what a beautiful SS! And bless you for converting the numbers for us.
Well, he seems to have decided to stay in the 400s today - and climbed from last night's PS. It's clear as mud to me that he either a) is still rebounding, or b) he needs more insulin :roll:
The thing that makes me think it might be rebound is that he is getting some pretty good action from the insulin. He dropped over 200 pts yesterday from am to pm PS. It is entirely possible that since diagnosis and a diet change (I am assuming he is on all low carb now) he doesn't need much, or any, insulin any more. He was started on too high a dose of caninsulin and raised too fast on it and that could have just set in all kinds of rebound responses. This can also cause insulin resistance, so there is a possibility that is going on instead - except for that response he got yesterday. Maybe that means he is breaking the resistance.
I know it's hard to be patient because you want him well NOW, but it is early days since the change to lev.