|Barked: Sat Feb 28, '09 7:50pm PST |
|I guess it depends on you definition of "large dog". Are you talking giant breed, such as great dane, irish wolfhound? Or large as in rottweiler, lab sized?
B/c golden retrievers and boxers are very prone to cancer, as are great danes.
Some may have to do with breeding. You breed a dog to be larger, and it is possible the outcome of that is to be more prone to cancer. No one knows the reason why or where cancer started being prevelent in these breeds.
As in the large breed dogs (or what I call medium sized...........lol), i think it has more to do with breeding. I'm guessing along the lines, cancer appeared in some lines, but by then, the dogs would have been bred many times over as cancer does not normally appear until a dog is middle aged or older. So unwittingly it was passed to the offspring and on and on and on it goes until it is riddled in the breed.
As far as dying sooner, for giant breeds............it does have to do with their size. you cannot have that large size w/o comprmising somewhere. It puts an incredible amount of stress on the joints, as well as on the heart. Look up acromegaly (or pictures of very tall people.........most have pituitary tumors) and you will see the same problems when humans grow too large beyond normal. Major joint problems and heart problems. They normally don't live past middle age. Same for dogs. Most don't live past what we consider to be middle age for dogs. Although with advances in medicine and diet, many are living past what the average age used to be.
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