No, No, No - you are not a bad mommy!!!!
I think, and I am no class trainer myself - not with my spotties - that he was still excited about you coming home. Such a short time to play with him BEFORE he was expected to be "good".
Funny thing, Captain was soooooo good when I trained him at home, but even though I walked 4 km's to training every Saturday, and he was still so good - the moment we got to the class - IGNORING ME!!!!!
I think he was just so happy to see you, Mark and ANYONE else - rather than be trained - he wanted to PLAY!
I bet next time he will be the ANGEL dog - and everyone at class will think you swopped Malone for another dog!!!!! 
M!
"No dog is born either vicious or friendly, but rather a blank slate that is moulded, for better or worse, by the owner."
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