Dogs feel comfortable with routine and consistency
Get into a predictable, structured routine as soon as you can.
Be consistent – things must always be allowed or never be allowed, such as are they allowed on the sofa or not?
Make sure your dog has a quiet place to retreat to if necessary and never disturb them when they are there. Some dogs like crates, but this needs to be trained specifically. » Read our advice on crate training
Sniffing and chewing are calming behaviours for dogs, so give them lots of long lasting chews or Kongs, and throw treats on the floor for them to sniff out.