We have always had more than one dog so we’ve been lucky that we have never had to deal with the problem of separation anxiety. But galgos and podencos are used to living in packs, so it is something which could be a problem if a rescue is adopted as an only dog. Having said that, some – notably ex racing greyhounds – have to live as an only dog.
This article from the People’s Dispensary for Sick Animals PDSA explores the problem.