What are signs that a dog has worms?

For some kinds you can tell because the poop has white things in it. Dogs usually will try to bite or lick their rear ends and in some cases they will scoot their butts along the grass or the floor. It is always wise to take a stool sample into your vets a couple of times a year, especially if your dog is out in a grassy area or in the country. Also, if you have a cat that roams around outside the worms can be tranferred to your dog. It really depends on what type of worm. A few signs for a few different types of worms are: loss of appetite, appetite without any weight gain, round like patches of hair loss (like circles), and seeing white squirmy things in its feces.