I'm devastated that I have to return the dog
What makes you feel so devastated about having to return the dog?
I really like the dog and the dog likes me a lot as well.
I understand, it's always sad when you have to return a pet you love. You should be happy for all the good times you've had with the dog.
it will be hard to see him go.
Well maybe this can be what encourages you to get your own dog. Dogs are such friendly creatures and can really turn into one of your best friends!