1. The effort of house training them from 'new' 2. The embarrassment of them humping anything with a leg 3. Having to clean up its waste (shudder) 4. Having to take it out in all weathers and at times inconvenient to you 5. The cost of feeding it 6. No chance of impromptu weekends/last minute holidays away due to having to find a kennel or tolerant friend to look after poochy 7. Vet's fees 8. It might be a barker 9. Its farts 10. Even if all of the above could be tolerated, one day, it will die and point ten is the main reason I won't have a dog. Last week, my sister's dog died. While they're young, they're fun and cute and then you have a friend and loyal companion. Then they age quicker than you and as much as you love them, they become a hinderance. But if they don't live to be old, I couldn't tolerate that. My sister's dog was the friendliest, funniest, cutest dog I've ever known and he was a total pleasure to be around but he didn't see old. He was only four and he contracted a cancer that's not unknown in that breed (a Scotty) and despite several very expensive courses of chemotherapy, he was eventually in so much pain, they had to have him put to sleep. He wasn't my dog but I fill up when I think about him and I've had so many dogs in my younger days, this is the reason I won't have one now.