A petition is calling for the dog trainer to cancel his show.

The probe stems from a controversial "Cesar 911" segment featuring a "pig-killing" dog and a group of pigs.

Get referrals. This may sound obvious, but even if you find a trainer in a phone book, ask if you can talk to a couple of his or her previous clients. They can give you an idea of the trainer's methods, "bedside manner," reliability, and willingness to follow through.

Keep in mind that dogs can make wonderful gifts, but unlike sweaters or socks, they aren't as easily returnable if the fit isn't just right.