i don't use my for normal daily works because they too need their exercise....but however there are situations where a stroller would come in handy....
for instance we have this annual pet expo here ... and there are tons and tons of dogs....and being an pet expo i enjoy taking my Yorkie there but because of not knowing what all those other dogs may carry as in sickness or whatever or how they act around other animals and for as crowded as it is there...i would not like my Yorkies to get hurt!
or for big meetups they work great also!
btw the one that i have is this one
http://cgi.ebay.com/Dog-Stroller-Pet...item2c531b631e
i love the jogging type stroller for they get around easier...hehe