That looks like a cat
who had 'prat' written on its side.
(
Psychosomatic Tumor Laugh your life cause there ain't much to cry for,
Sun 5 Mar 2006, 22:58,
archived)
I also thought that.
There was a dog one that looked more like spratts, but the slogan wasn't as amusing.
(
JimmerUK Everyone's Favourite Jim,
Sun 5 Mar 2006, 23:02,
archived)