person A: Our dog is getting older and having issues.
person B: I am so sorry to hear that. I know what that is like unfortunately.
person A: Thanks. It is hard when they are a part of your family.
person B: Yes definitely. My thoughts are with you_comma_ I hope he still has many years left.
person A: Thanks again.  He is 16 and has lived a long life_comma_ so hopefully it won't be as hard as it feels.