doggie questions

for the longest time, i have been seeing and interpreting sapphie's expressions, actions etc in human term. for example, when she stretches her lips sideways, i call see it as her smiling. and that i interpreted it as her being happy. or when she sleeps and makes noise, i deemed it as her dreaming... thing is - i am not sure if interpreting her expressions using the human as an example is realistic... - some questions i have:

• when i dog smile, does it mean it is happy?
• do dogs dream?
• do dogs feel the same way humans do?
• how do dogs express their emotions?

i think i need to do some reading up on this...

heh heh...

:-)

ps: dog in photo is not sapphie. photo courtesy of http://miners.com/?tag=lucid-dreaming