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					Originally Posted by beano  diseases?!! what diseases!!!!-arent yours innoculated against all? | 
 
  If you mean what diseases warrant the use of a stroller, then: 
Dogs recovering from surgery
Legg calves perthes
Intervertebral disc disease
Hip dysplasia
Arthritis
Collasping trachea
Congestive heart failure
Neurological disorders
...to name just a few. 
I agree that they should not be used to replace walks unless a health problem makes walking dangerous. There are good reasons to use them. And while I hope your pups are healthy enough not to require it (or big enough not to get stepped on in crowds, etc.), remember not all of us are in the same situation. If I want to walk my dog name, it is medically necessary (unless I carry her).