Oh, I am so sorry that this happened. You must remember that the
incident was not intentional on your part. Two baby deer wandering alone
would never have made it on their own even if they were outside your fence.

I would feel awful too, if my dogs had attacked another animal anywhere.

I always wait when opening the back door to give any squrrels plenty of
notice that the dogs are coming.

Please be kind to yourself (and the pups too). (((Hugs)))