You have our most heartfelt condolences to you and your family on the loss of [Pet's Name].
We're so sorry for your loss. [Pet's Name] was a beautiful [dog/cat/etc/] and you were such a great and caring owner.
There are no words to ease your sorrow for the loss of your pet. Just know our thoughts are with you
[Pet's Name] was a special friend and will be missed by us all.
Wishing you our deepest sympathies on the loss of [Pet's Name], he/she is irreplaceable.
You have our sincere condolences on your loss.
Extending our deepest sympathies on the loss of [Pet's Name]
May fond memories of [Pet's Name] warm your heart.
Saying goodbye is never easy, I'm so sorry for your loss.
I'm so sorry to hear about your loss. [Pet's Name] will be missed by everyone who has met him/her.
You are in our thoughts during this difficult time. We know that [Pet's Name] was a very special member of your family.
We're so sorry to hear about your loss. We know that [Pet's Name] meant so much to you.
I'm so sorry to learn about the passing of your [Pet's Name]. I know [he/she] meant so much to you.
Losing a close friend is never easy. You'll be in our thoughts and prayers.
Extending our heartfelt sympathies on losing the most lovable member of your family.
I know no words can help to ease your suffering but I wanted to let you know that I'm thinking of you in this difficult time.
I know [Pet's Name] was much more that a pet to you, [he/she] was a great friend, and a beloved member of your family. You have my sincerect sympathies.