what an adorable pic...and what a pair!! it sure looks to me like sumo is gearing up to be a forever big brother!!
i know what you mean about having a lot to learn about these little ones. i always had big dogs before lulu and yes, there are lots of differences! good news is....you've definitely come to the right place. i've spent hours upon hours reading the information here. the benefit has been immeasurable already.
my suggestion would just be to dig around a bit...if you read up in the general, health, and sick sections.....you'll be surprised at how many other people have had similar questions!
welcome.
