Photographing a puppy

So our new pup went to the vets yesterday and the little man weighs 28.6lbs at 11.5 weeks.  I think he is gonna grow up and be a very big boy.  Vet said, he is doing great and see us in a month for the rabies shot.  We will take our other girl ( our Brindle English Mastiff) with us then too as she will need a booster.
  Picture of Hades at 8 weeks, and Rhea at 4 years.

Anyways, today I will be photographing Hades in studio.  He is just learning is sit & stay commands so I will get some help as I don't want him jumping down from a prop or such.  My son is home today ( bus cancelled due to fog) so having him as an assistant is great!  Plus, nice to work with him off and on.  Puppies can be very difficult to capture, sometimes they look too sad as they don't know what you are doing , sometimes they are just to curious and won't sit still.  So, you never know how it is going to go.  I use treats, squeaker toys and praise to try and get great shots.   Wish me luck!!