How hard is it to add to your family of pets?

In my experience with adding a pet, I didn't see any resistance. When our first dog died, our second dog Epoy was left alone. After some months, someone gave us a puppy that we named Tisoy for his white coat. Epoy was curious at first but he didn't antagonize the puppy albeit it looked like Epoy was glad to have a companion. When Epoy died, Tisoy had new companions, 2 puppies this time. And like Epoy, Tisoy was just curious with the puppies but after a few days, we didn't see any antagonism in Tisoy.

Now Tisoy is 8 years old while the 2 puppies - Pipoy the pug and Barbie the pekingese - are both turning 4 soon.