Eating dogs is disgusting to some people, just like how eating any type of animal is disgusting to others. There isn't anything wrong with that. People are entitled to their opinions. Some people find eating dogs to be disgusting, others find eating lobsters to be disgusting - it's just a personal opinion.
It'd only be a problem if someone generalizes a person's eating habits to be characteristic of that person him/herself (i.e., "If you eat dogs, you must be a nasty person").