I accidentally felt Turbo's throat when he was barking bc he was freaking out when he saw a dog walking by when we were in the car

loll & I felt a balloon like bubble on his throat whenever he barked! Is that how it's supposed to be?
So I felt Momo's throat when we drove by someone on a bicycle (he always barks @ the people on the bicycle, he thinks it's strange) & didn't feel anything...is something wrong w/Turbo's throat or Momo's throat? I can't test on Mimi & Princess bc I don't know when they're gonna bark. Turbo has a very loud bark, Momo's is not as loud, maybe that's why?
Of course, I googled & not sure if I'm not inserting the right words on search but couldn't find anything.