Hint: Move list:
Note: Unlock the extra moves by winning Doggy Doo games. 

Sit down: Press Down.
Lie down: Press Down while sitting down.
Sit up: Press Up while lying down.
Stand up: Press Up while sitting down.
Shake body: Press Left, Right, Left.
Beg 1: Press Left, Right, Up.
Beg 2: Press Right, Down, Up.
Beg 3: Press Left, Up, Down.
Beg 4: Press Left, Left, Right.
Beg 5: Press Left, Down, Up.
Fart or poop: Press Left, Right, Down.
Pee left: Press Left, Down, Left.
Pee right: Press Right, Down, Right 

Never Hungry:
When walking around you will see crates every now and again. If you smash into 
these by running into them food will come out. Eat this and you won't be hungry.

Regain health:
Use one of the beg moves near a human and they might give you a treat.