I have a small list of things that my boys do to show they love mommy:
 
Joey:
- whenever I am sad he knows it, and he will cuddle me (he's not a huge cuddler)
-when I get angry at mario kart for not being fair, he comes to give me kisses, as if to say "it's alright mommy, i'm here!"
- he barks at me for attention, then he will get right in my face and give me kisses
- he puts up with my kiss attacks and other lovey dovey stuff
 
Tank:
- when I get home he wags his tail so hard that his whole butt wiggles, hence the nickname "wigglebutt"
- he will cuddle me whenever I want to cuddle! 
- whenever we let the dogs sleep in bed with us, Tank will stay all night cuddled up against me
- when daddy starts tickling wars, tank barks at him to make sure mommy is ok