We have two of these, the other is Brown instead of pink yet the two lads prefer the pink one. I asked a dog behaviourist if dogs can see particular colours and take a preference. He said he has never read anything to suggest preferences or definition of colours but thinks it is more of the brightness of the colour that attracts them.
I can see this as they also have a bright pink octopus which they both love and it is these two toys that they tend to play with the most.
I love watching them play, Red always wants whatever Jake has got.