Congrats durham! I like "mau mau" too.
I've recommended it before, but I still haven't found a better all-purpose cat book than Pam Johnson-Bennett's Think Like A Cat.
Buckley's adorable. Mouthiness is very common in puppies; combination of interrupt ("NO!")/ignore (back turned, arms crossed, total death silence treatment for 10-30 seconds) for the unwanted behavior and positive reinforcement (praise/attention, occasional but infrequent treats) for polite behavior (I usually select for a polite default Sit, but you can do what you want) usually works pretty quickly to resolve it. Timing and consistency are key -- you need to build up associations that good behavior causes good things to happen, and bad behavior causes those good things go to away -- so the better you are with delivering your responses quickly and the more consistently you do so, the sooner the unwanted behavior will recede.
It's also very common for a dog's behavior to be somewhat suppressed when it first arrives in a new environment populated by strangers, which is why virtually every dog initially appears to be exceptionally polite, quiet, and well-behaved when it first comes home. The dog's real personality should start to become more obvious after a couple of days, although shy dogs can take weeks to relax.
Dog Mob's enjoying Nantucket, although they're also both a little stressed out right now.
In the car:

In our cottage this morning:

I'll try to get SVC to take some pictures from more than 10 feet away later. I can't do it because Dog Mob won't let me get more than 10 feet away, so all the vacation pictures I take look like we're still at home and just changed the carpet.
They didn't eat much of their breakfast this morning but they did spill a lot of it on the porch, so there are some fat crows in the trees outside trying to decide if they dare swoop down and try to steal some of that spilled food. The crows have been working up their courage for about 20 minutes now. Crookytail has yet to notice them (somehow -- the birds are really loud so I'm not sure why he's so oblivious to them) but Pongu does not like them one bit.
There are a lot of dogs on Nantucket. The only actual mutts I've seen, other than Dog Mob, belong to the servers and other people who live here. All the guests have purebreds or crossbreeds (
so many labradoodles); we've encountered one other tourist with a mutt. Everyone keeps asking what kind of dog Crookytail is, and apparently expecting the answer to be some rare European breed instead of "pound dog from North Carolina."
Unsurprisingly, many of these dogs are very poorly trained. This is the first place I've been where lots of the restaurants have outdoor seating but won't let you bring your dog to the table (in Philly, basically any place that has outdoor tables allows dogs in the outdoor area; here, we're at about 30% so far). I don't blame them, though. The mutts have all been totally awesome, and one pair of Labs was great, but that's about it. There's a special kind of nitwit who spends thousands of dollars on a dog and then totally neglects its basic psychological needs, and that type is awfully overrepresented on this island. Their kids have mostly been super polite about asking before approaching the dogs, though. I wonder if there's a correlation...