Have you ever been playing with your dog only to notice that their teeth are visibly — and audibly — chattering? Teeth chattering in dogs is a pretty common behavior, although it can be unsettling.

Wheeking, purring, chutting, chirping and chattering. For small animals, guinea pigs can make big noises and, according to experts, they're communicating with each other - and with us. Sue Tate has ...