A gentle start to October with this old friend.
Labs are not the easiest of dogs to paint. I find the colour matching tricky. The main risk is that they become paler and paler so in extreme cases you "run out" of light paint and cannot get any lighter as you have already drifted into pure white. This is usually referred to as a beginner's mistake, I know, but it is one of the easiest to make, especially if you're not concentrating: I still do it often.
Here's a tip: pin a pure white index card against the image you are working from - or hold it up if you are working from life. Things are just not as "white" as you think they are. Unless you are painting a Samoyed or similar:
in which case it is permissible to lose the will to live. I was commissioned to paint a bichon frise not long ago. He had been freshly groomed for his portrait.
He looked like a dandelion clock with two button black eyes.