You could say
You: I hear Flinn followed you and grandma all the way to the shop today!
Her: Yes it was so funny!
You: I bet it was!
Her: Yes he even came in the shop with us, and Grandma didn't like it, but I thought it was funny.
You: It was pretty sweet of him!
Her: Yeah, I love Flynn, he's my favourite dog!
You: He's pretty special!