Loneliness is a complex problem of epidemic proportions, affecting millions from all walks of life.
Verified by Psychology Today
I hope your nephew makes a full recovery. As a veterinarian my concern would be a young child not under constant supervision when any dog was in the same area. Young children do not read dogs well. As far as pure bred vs "mutt" any dog can have behaviour issues and I could list several pure breeds that I see daily that have anxiety /aggression issues.
Dogs are more aggressive around people with one particular personality trait.
Social interactions with a therapy dog help canines as well as humans
Data shows that dogs who look at you with their head tilted seem "cuter".
Get the help you need from a therapist near you–a FREE service from Psychology Today.