I shall have to try when in San Diego! I've also seen a huge ice cream dessert served in a plastic baseball helmet but I can't remember which team it was now.
Was many years ago, but the experience at Petco was great. I think they value good food there (San Diego in general) so you're bound to get a good experience. In truth, it was probably a Hebrew National dog (which you can find lots of places), but I enjoyed it.