person A: I had to euthanize my dog of 11 years last month_comma_ I still think about him every day.
person B: I'm sorry to hear that_comma_ I have two dogs and know how they become part of the family.
person A: Thanks for realizing my pain. It saddens me that I these lovely companions can't live with us forever. 
person B: I know_comma_ it's defenitly painful to have to go through but its part of life. Maybe get a new puppy to start loving/sharing life with_comma_ shelters have so many dogs that need homes!