As an aside, this makes me feel like Ralphie writing his theme in desperate hopes to get that air rifle. Hope Laura Hudson doesn't tell me I'll shoot my eye out.
Hard to figure out which non-speaking animal is my favorite since LOCKJAW AND THE PET AVENGERS came out, but I'm going to go with: Robin Robin, Robin's pet Robin in TINY TITANS.
I imagine that given the ability of speech, his first words would be "AW YEAH, PET CLUB!" Maybe followed up with, "Wait, which Robin is mine?"