noise

Ive been meaning to join this website for a while but every issue I've had with my piggies has been resolved but not this one, I'm unsure about a noise my guinea pigs are making when they clean themselves. It's kind of like a bubbling noise but it's not, it's hard to explain, first only Honey...

My Benji appears to not react to sound anymore. I don't know how long this has been going on but I just noticed it in the past month. If I put the hoover on or even the hand vacuum in the cage he never reacts even though it is right next to him! The other piggies just run away pretty much like...