Only with a wrong diet.Please link at http://dogs.about.com/od/dietandnutrition/Diet_and_Nutrition.htm to understand your dog´s problem.

Animals are not capable of thinking or rationalizing in the manners that humans do. Nowhere is this more obvious than in comparing Domestic Animals to Exotic (Wild) Animals. Domestic Animals who are kept by humans, as companions are usually taught behaviors by the humans. We teach our dog, bird, horse to do things that matter to US. What we teach may be connected to a "natural behavior" that the animal already has some tendency to do; but we build on that and make "IT" important to the animal, by using some sort of motivational tool. Hopefully, we use Positive Reinforcements, praise, treats, but in the past FEAR was also often used to motivate desired behaviors as well and even now there are trainers who use aversion training to promote behaviors or subdue "normal" behaviors we don't want the animal to do. Animals do not understand OUR concept of Guilt. However, they can learn to anticipate reactions and behaviors from US that can cause them stress, or fear, or joy. Another point to keep in mind is that while you may not (and I agree who would chastise an animal for farting?! lol) SAY any thing like bad dog...you may have said SOMETHING ELSE or your facial expression, or body language may have conveyed some dismay over his problem. Animals do not speak our verbal language as a rule (parrots aside). But Dogs and Horses and other animals DO pay attention to and learn to read our body language, tone of voice, and sometimes facial expressions. They also learn to recognize some words and associate them with different behaviors and then anticipate a reaction from us if they do those behaviors. That's what training is all about. If we pay attention closely, we can almost always find things we ACCIDENTALLY taught an animal to do. These "things" may be good and useful to us and the relationship we have with the animal, or they may be horrible things that we sure wish the animal would never do again! HOW could this happen?!! Because we are so depending on our words, we forget that animals are NOT only learning verbal commands, but silent ones as well. This is typical with a call from a potential client who says, "my horse has a problem." Upon watching the horse and rider together, usually, it's not the horse that has a problem. It's the rider miscuing the horse or accidentally punishing the horse, and indirectly TEACHING the horse to do a behavior they really don't want the horse to do! It is common with dogs as well. So, I'd have to say NO, animals are not born with moral values that are anything akin to what we would call moral values. Good care, and love, patience and accountability that spawns trust in us, can promote an animal being willing to "give back" affection to us. We become the giver of "GOOD THINGS" and then the receiver of good things back. Can animals learn to love? Maybe not in the exact way we perceive love, but I'll have to piss off some behaviorists by saying...As far as I'm concerned, Yes they can and many, many DO. AS FOR THE FARTING...you assuredly need to think about your dog's current diet, read the ingredients on the feed..can, bag, pouch...Avoid CORN, avoid anything semi-moist...that's just garbage feed...high oil and sugar...try something with high meat (not by-products) brown rice and or oatmeal...Beet Pulp is also a good filler as it helps the dog with shedding the stomach lining...something they do about every THREE DAYS. His "looks" may be related to some stomach discomfort...after all being gassy can HURT!

i think some do

No but your dog loves you beyond belief and will do whatever they can to please you and avoid doing things they know you don't like (if you are right there) but those things are NOT "moral values".