Edit the source and recompile, because AFAIK this isn't configurable(*). By the way, this isn't not a dog, this is Wilber, the Gimp's mascot, more like a cousin of the coyote, according to lore.
But the best way to get rid of it is to load an image.
(*) Another way is to try to run Glimpse, which is a fork of Gimp to rename it remove anything that could be deemed unholy or objectionable (like Gimp's name itself). However the whole thing stalled after Gimp 2.10.18.
But the best way to get rid of it is to load an image.
(*) Another way is to try to run Glimpse, which is a fork of Gimp to rename it remove anything that could be deemed unholy or objectionable (like Gimp's name itself). However the whole thing stalled after Gimp 2.10.18.