No problem with making them a post-Christmas holiday in my opinion.
The year my son turned 13 (Christmas Eve baby), he was out shoveling the driveway and when he came the yard, one of our dogs went apesh*t and attacked him. Needless to say, that year Christmas cards were not top priority. Family and friends got Valentine's Day cards with "the letter" and no one cared a whit.
Boy-child ended up with a LOT of stitches in his arms and dog was PTS. He described her as being 'gone' - no recognition in her eyes, etc - we believe it was a form of seizure. She'd had a few small incidents of aggression since we'd gotten her, also accompanied by that 'blank' look, but nothing like this. Our other dog got between them and defended my son once he shook off the younger dog, holding the offender on the far side of the room until dad got there. I was out getting birthday cake and got home to a note that said "go to the hospital now!". A holiday to remember, er, forget. But I digress...sorry. Apparently I needed to tell that story one more time for some reason.
The boy is now 25 and has two small ones of his own, is not afraid of dogs and still has some interesting scars on his arms. He varies in the story he tells about them!
Interestingly, the "defender" dog knew immediately when the boy came home from the hospital that he would be leery about dogs in general, and carefully kept himself on the opposite side of any room they were both in, tail/butt wagging occassionally.
As he sensed the fear abating, he would get a little closer and a little closer and on the third day post-hospital, happily napped with his head on the sleeping boys lap.