I am not really a dog person sassy (and DH is allergic anyway) but one of my friends has 4 kids. Her DD is in a wheelchair and her 3 DS's are WILD and yet they decided to get a dog (at about the same time as M was born, and his name is also M!).
I thought she was crazy but it seems to work well for her. The kids adore the dog, it gets them all out of the house, or gets my friend out of the house for an evening walk/at weekends/while the kdis are at school so she gets some time for her own thoughts.
Sorry, that wasn't really talking sense into you 
DM and DF just left to head back to the UK. I am finally feeling like a human being now, DH back at work, DS sleeping. I should be working, but am enjoying lazing on the sofa far too much. Marking will keep till tomorrow afternoon.
Duck M grinds his teeth, drives me mad.
M has a new word - 'out' 
pebble your last 6 weeks sounds like mine. The last 6 weeks for us have been: flu all round, DS chest infection, DS and DH d&v, flu all round. Add that to serious blues in January (i do sometimes wonder if I have SAD) and 2013 has been a pile of shite so far. Still, spring is coming (no snow here since...oooh...last Wednesday), it's getting lighter and only one more week of school before I get a week off.