Thanks for the happy update! I'm glad to hear Arlo is recovering nicely after his encounter with canine teeth.
I agree with Skitty's_Daddy, a prey animal tormenting a natural predator is nothing to make light of. Do you let Arlo interact with your terrior while Arlo is out of his cage?
After Arlo's misfortunate encounter with your Wolfhound, I'm surprised you'd take a chance by allowing your bird to pick on your terrier. Most terriers have a high prey drive. You were given a lot of good advice in your thread about Arlo being attacked. No one wants to offend you, we are just hoping to help you avoid a disaster. Dogs, no matter how small are capable of inflicting serious or fatal injuries to birds and it can happen in the blink of an eye.