A wolf's stowaways
Since the year 2000, the Eurasian grey wolf, Canis lupus lupus, has spread across Germany. For researchers, a good reason to have a closer look at the small “occupants” of this returnee and to ask the question whether the number and species of parasites change with an increasing wolf population. This was the case, because the number of parasite species per individual wolf increased as the wolf population expanded. Furthermore, cubs had a higher diversity of parasite species than older animals. The good news: wolf parasites do not pose a threat to human health. Ref. Source 7v
Image from Wikimedia public domain.
Eurasian Grey Wolf (Hover)
It is common that when you buy a puppy one of the first things you do is get it dewormed. That in itself tends to back up this fact. Parasites seem to be common in wolves and other canine species. So the more canines that are in a area would also mean that there are more parasites in the same area that are commonly found in canines.