We were very worried about leaving our French-rescue-mongrel-terrier who must have had an appalling youth (we got him aged about 15 mths. he was half-starved and chasing lorries on an N road. Also a bit barmy, aggressive towards other male dogs etc., and completely wild. A tough call.
We left him for 3 days in a good kennels in France when we'd had him for a few months - and were asked not to leave him again. He had barked constantly. He was deleriously happy when we picked him up - jumping up in circles in the air peeing at the same time etc..
10 yrs. later he had never been apart from us, but we had to leave him to attend a family wedding in Devon. We asked around and got a recommendation from someone who has 3 dogs. This kennels was associated with the Rescue Dogs association and understood odd dogs.
We left him with huge trepidation, his chews toys and an old jumper that we had both worn for a few hours.
He was fine. We couldn't believe it, but he was. He had given no trouble and trotted happily back to the car, but no delirium.
Check your kennels carefully, ask at the vets, I think you and they will be OK. :)