Second rescue dog turns out to be the sister of their first rescue dog.

[Catherine]

A family rescued a dog and were very happy with her. Three years later they decided to rescue a second dog.
They saw a picture of a dog that looked like their dog. So, they rescued that dog. The two dogs were so much alike that they had their DNA tested.
The two dogs are sisters. No wonder they look so much alike and hit it off so well.

https://pethelpful.com/pet-news/dogs-ado...f-lifetime

That would be so amazing to adopt your pet's  sibling. It is like having all the wonderful love of your pet doubled. You get to see your pet happy with her double.
They made the right choice when they brought the second rescue dog home.