They could've eaten something bad, they could've not had their vaccines and was around other dogs or animals and their feces, or the dog could've gotten a parasite, like fleas or ticks.
Dogs, get worms from the infected foods and water that they take.
Ans 2 - And also from licking grass where infected animals have defecated.
The answer is NO humans can not get worms from dogs
Yes. Though the parasitic worms of horses are similar to the worms of dogs, they are not the the same. This means that horses won't pick up worms from dogs and vice versa.
Dogs can certainly have worms and parvo at the same time. But worms in the feces definitely means the dog has worms.
yes.
no
Worms live in poop. By eating poop they have worms and barf
No,intestinal worms and tape worms are possibilities
no
The answer is no.
yes they can
nope
i dont know what you mean by the late part but dogs cant get worms from chocolate