Dogs have gas for the same reason that humans have gas. Air bubbles are swallowed while eating, and if they don't come out from the mouth, they come out... below.
black worm come from my dog faeces is first time I have seen!!
Black stool is a condition where the feces are very dark and nearly black. Sometimes this is caused by supplements. Other times it is indicative of internal bleeding.
You are not going to be able to do this unless you simply keep the dog away from the feces. Why? Because to the dog the feces is a treat and taste good. The good news is that as long as the mini piglet is healthy, its feces is healthy, too, and it won't hurt the dog. Just make sure the dog has access to it's own good food, which is, of course, more nutritious than the feces. Then you can thank the dog for cleaning up the feces for you - just don't let him kiss you right afterward.
make you ill
Black specks around a dog's anus could be caused by flea dirt, which is the feces of fleas that appear as small black specks. It is important to check for fleas and consult a veterinarian for proper treatment.
Because your dog is sick.
Yes. It can spread through feces. If you're dog likes to play in the litter box, he could get the feces on his/her paws, and then lick them. BAM! your dog has hookworm.
yes
Yes.
The color of feces is caused by something he is eating.
Actually, Dog feces is very harmful to your plants. Grazing and grain eating animals are fine and that is why you see chicken feces fertilizer a lot but not many other animals.
If your dog is eating it's feces, that likely means that he is eating too fast and therefore is not properly digesting his food, so there are still nutrients and a good taste left in his feces (that's why he wants to eat it). You have to make your dog eat slower.