roundworms are contagious to other dogs but they cannot be passed from dog to dog just by being int he same room. However, if the dogs have defecated in the room and there are traces of the stool on the floor there is a chance that the worms can be passed from dog to dog.
Can a dog pass worms to another dog?
“Worms can be picked up from your dog's stool and contaminated soil. They can infect other dogs, and in some cases, people can contract certain types of worms. That's one reason it's important that you always carefully clean up your dog's stool.”
Can puppies transfer worms?
The short answer is yes, many worms infesting dogs are zoonotic, meaning they can be transmitted from animals to humans.
How are worms passed between dogs?
Infected dogs shed the microscopic roundworm eggs in their feces. Other dogs may become infected by sniffing or licking infected feces. Roundworm eggs can also be spread by other animals such as rodents, earthworms, cockroaches, and birds.
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