Reading this makes me feel really sad. Fair enough if you don't like the smell of dogs or dealing with poo or whatever, and fair enough that a child has been clamouring on about getting a puppy because they don't know any better. But how can a fully grown adult look at the eyes of an animal, any animal at all, and not think of how they're ultimately buying a life? How can you buy a dog without discussing beforehand potential veterinary issues, how much exercise they'll need, how much time you'll need to put in to train or take to classes, what kind of diet you're going to be feeding it to make sure it grows up strong and healthy? How can you buy a dog without considering whether you're prepared for the responsibility of an animal, of being all it knows, of being the one whose decisions 100% dicate its life, of being the one who may one day have to make the call to put it to sleep?
Of course I don't know that your colleague hasn't considered all this, but your description of her makes me doubt it