Help - Search - Members - Calendar
Full Version: I have a Question
Unexplained Mysteries Discussion Forums > Other > General Off-Topic Discussion
Sam Willey
Hello everyone.

I was just randomly thinking about this today and thought I would consult you all to find an answers. I have two dogs one is 5 years old and the other is 2 years old. And i was thinking that dogs only live to be around 10 - 15 years old on average (i think) and the question of Why just suddenly came to me. So my question is - Why do dogs not live very long? unsure.gif

I hope you can all help me with the answer. thumbsup.gif

Thanks!

Sam. original.gif
Leonardo
Sam,

Found this on Wikipedia:

QUOTE
The different lifespans of different plants and animals, including humans raises the question of why such lifespans are found.

The evolutionary theory is that organisms that are able by virtue of their defenses or lifestyle to live for long periods whilst avoiding accidents, disease, predation etc. are likely to have genes that code for slow aging- good repair.

This is so because if a change to the organism (for example a bird might evolve stronger wings) may mean that it is exceptionally capable of escaping from predation, then it will live longer, and typically die of old age. It will also be more likely to survive to reproduce, so these genes will spread through the gene pool. Then, a member of the population with the better wings who by chance also has genes that code for better repair will spend a longer time its contemporaries in the best reproductive years and have more successors. Its genes will tend to dominate more and more of the gene pool and genes for slower aging and by a similar argument a slower reproduction rate, will dominate.

Conversely a change to the environment that means that organisms die younger from a common disease or a new threat from a predator will mean that organisms that have genes that code for putting more energy into reproduction than repair will do better.

The support for this theory includes the fact that better defended animals, for example small birds that can fly away from danger live for a decade or more whereas mice which cannot, die of old age in a year or two. Tortoises and turtles are very well defended indeed and can live for over a hundred years.


source

I'd translate this as meaning that, since dogs are domesticated predatory animals, reaching an older age wasn't necessary for their success in reproduction. Much more of their evolutionary energy would be used to make them more efficient hunters rather than survive to an old age.

Hope this helps.
Sam Willey
Thank you for the answer Leonardo! original.gif
Seraphina
Don't forget, also, that humans have well and truly messed up dogs by breeding them...many breeds of dogs have horrific problems being passed down in their genes - they were never meant to exist in nature, and as a result undesirable genes are being passed on.

It's possible that the life span of dogs is simply going to get shorter and shorter because of the way they're bred....but mleh, I'm not a breeder, what do I know?
SpeedOfDark
If I had to blindly pick 1 reason... I'd have to go with the fact that they lick everything. Think how long humans would live with the hygiene habits of a dog... probably not 80-100 years. :S Obviously there are other evolutionary/genetic factors, because a hygiene/lifestyle argument would not explain why 2 different species with seemingly equivalent hygienic/survival habits would have very different lifespans... but I think leonardo covered that one for you more than I possibly could.
War-Junkie
well dogs have one of the cleanest mouths, cleaner than humans i think its because there is a chemical in there mouths that kill bacteria so they can clean there private parts.
Episteme
QUOTE(War-Junkie @ Nov 12 2006, 08:00 PM) [snapback]1424932[/snapback]
well dogs have one of the cleanest mouths

Part true, part wives tale. The only true part would be that dogs diseases and viruses for the most part are not contagious to humans. However they do put their mouths on some of the most disgusting things imaginable, which makes them quite filthy. I've never heard of the chemical thing, will have to look that one up when I have more time.

I've been doing alot of research on this lately. Partly because our almost 7 year old lab got cancer (spleen) and passed so young, and partly because we have a 9 month old and I want what is best for him. I've found that many pet health professionals believe that the increased cancer rates in the last 20 years or so is a direct link to what we now feed our animals - commercial dog food. What kind of "meat" do they get?

QUOTE
In his 1986 book Pet Allergies veterinarian Al Plechner sums up what goes into companion animals food: Condemned parts and animals rejected for human consumption are routinely rerouted for commercial pet foods. A similar fate applies to so-called 4-D animals. These are food animals picked up dead, or that are dying, diseased, or disabled, and do not meet human-food qualifications. They are processed straightaway for companion animal consumption. Little goes to waste. Says Plechner, Food processing refuse of all sorts winds up in your animals dinner bowls. Moldy grains. Rancid foods. Meat meal. The latter is ground-up slaughterhouse discards often containing disease-ridden tissue and high levels of hormones and pesticides, the very things that may have contributed to the death of the steer or hog. A decade later, his words still apply. When cattle, swine, chickens, lambs, or other animals meet their ends at a slaughterhouse, the choice cuts -- lean muscle tissue and organs prized by humans -- are trimmed away from the carcass for human consumption. Whatever remains of the carcass (bones, blood, pus, intestines, ligaments, subcutaneous fat, hooves, horns, beaks, and any other parts not normally consumed by humans) is, according to the pet food industry, perfectly fit as a protein source for cat and dog food.

Source

Other nastiness in commercial dog food may or may not include:

euthanized animals - yes, even dogs and cats have been proven to go into some dog food
brains - safe to eat???
grease - pancreatitis & cancer
grain - most dogs are not tolerant or even have allergies
additives - I won't even GO there...

We can't even blame the pet food companies because the regulations (at least in the states) don't ALLOW them to put the exact ingredients on the bags! Heaven forbid we know what the nasty dog food and good dog food is at the store...

The good news is, there are dog foods that are safer to feed. Table scrapps and butcher items are even safer, as long as you know what table scrapps are acceptable for animals. Here is a good source for hunting down the right food, but you'll have to dig through some threads. Some of the brands you might find on the forums I've linked have websites with store locators. We have about a 30 minute drive and end up spending about $8 more a month, but also substitute a small portion of food with table scrapps daily. I'll let you know in 5-12 years if the extra effort helps, but at least it's given us peace of mind that he's not eating that garbage. yes.gif
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.
Invision Power Board © 2001-2008 Invision Power Services, Inc.