I wouldn't clone my dog because he would NOT be the same. Visually, yes, but just like twins have separate personalities, so do clones.
Not to mention, I love my Trek's personality tremendously and if I had a look-a-like who didn't like to stick his head under water for five minutes trying to get a shell, doesn't like splashing tide-pools with his front paws, didn't go after a smell, then get distracted by a butterfly, then something shiny, then the smell again, then a crow or seagull that just took off, then I would be ABSOLUTELY heartbroken.
Trek can make you laugh just by looking at him, asleep or awake. It is just his aura. And NO clone can ever replicate that. Ever. And I would just be ignorant and stupid to ever think I could. And that would be the only reason why I would ever consider cloning.
Well, almost. Another reason would be to see him as a pup. I got him from a shelter two years ago, when he was around two years of age. He was sickly and starved and I hated yet loved the previous owners for giving him up.
I would love a chance to raise him so such a wonderful dog, original or not, would have a chance at a better beginning. Maybe then he wouldn't be so determined to steal thinking its his last meal, or be soo fearful of abandonment that he rushes past you up the steps and whines and jumps at the door to get in.
If I had the opportunity to change his puppyhood, regardless if it is a clone, then I would in a heartbeat. I would have my memories of the previous Trek, yet treat the new dog as a separate entity while ensuring he never has to endure what Trek did.
But I would also choose to adopt again if I had to. Which I will do once the time is right again.
No, because their DNA is still the same. If they ever tried to mate, it would be like making a child with your brother or sister. You will come out genetically harmed and possibly unable to breed.
The only way that would work is to have two separate DNA strands (not from the same family) and genetically modify them before cloning, or during. For example, what they are trying to do for humans. You can genetically modify your child when it is being formed or something, and pick certain traits you want to become dominate. Such as good vision or red hair.
If you can do that, then you can probably have enough clones to produce several healthy lines, and continue to modify their DNA to ensure a safe future.
But we are FAR from this. FAR from it to make any attempt to genetically engineer to this degree.