I sometimes save random people's photos of their pets just because I want to use them as my phone wallpaper.
Can you not use other photos instead?
They are the only decent photos I've seen in a while.
I think you should not use those photos unless you get permission from the pet owner. It can cause confusion.
So what? What's the big deal about taking an image of someone's pet for my wallpaper? I'm sure it's not their baby.
While pets are really cute, it's still not yours and it's always good to ask permission first! People may mistake it for your pet when it's really not. So how about asking these people for their photos, I'm sure they'll be flattered that their pet is admired!