Any dog owner will tell you that anyone can learn the language of DOG very quickly. All you have to do is learn to listen. They enunciate clearly. Having that type of relationship with your fur friend is also difficult because you always know when it is time for them to cross the Rainbow Bridge. I believe they prepare us for their final good-bye.
We have rescued more than two dozen dogs over the course of many years and it is never easy to say good-bye. It doesn't matter if they were with us for a couple of years or close to twenty. I dread the day each time as I realize it is getting closer. But I will never allow my dogs to suffer by keeping them alive for my selfish reasons. My dogs talk to me and if you are prepared to listen then you will be able to talk to them as well.
Rescue dogs make the best pets. They communicate their appreciation of being rescued in a variety of ways. Mostly you see it in their eyes but their actions speak louder than any human words. Their constant need to have you in their sight or touching you while they sleep are a couple of ways they let you know how much they love you.