person A: I had to take my dog to the vet today
person B: Oh no_comma_ is there something wrong with your dog?
person A: Yes_comma_ he hasn't been feeling well. The vet had to put him down. ;(
person B: I know words don't really help in this situation_comma_ but I'm so sorry. I've lost many pets and it rips your heart out. I'm sure you're dog had a great life with you if it's any consolation.