Adult Cat vs. Kitten
When you first visit a shelter you'll be torn between appealing kittens clustered in cages, but keep in mind that grown cats often are more "user-friendly", and will be ever-so-happy to find a new home. These cats often came from a happy family setting, and were given up because of illness of an owner, divorce, death, etc. The benefits to you in adopting an older cat are many:

The benefit to the older cat is that most of these cats will not find homes, because people naturally gravitate toward the kittens.

A final consideration is your own age. If you are 65 or older, it is always possible that you will not outlive your cat, so an older cat would be an excellent choice. You might even want to adopt a "disabled" cat, one that is blind, an amputee, or otherwise "unadoptable." These cats make wonderful companions and compensate for their "disabilities" with a wealth of love and devotion for their human savior.

If you are younger, with school-age children, a cat that is one or two years old would be a great choice, and s/he can grow up with your children.

One or More Cats?
You may have not even entertained the idea of adopting more than one cat, but it is not unusual for someone to go to a shelter to adopt one kitty and come home with two. You may fall in love with a beautiful, personable cat, only to find that she has a litter mate or "best friend" and can only be adopted as part of a pair. My response to that scenario is that if you have the space in your home and your heart and the resources to care for more than one, you'll be rewarded with much more than twice the amount of joy. This is particularly true when getting a kitten. Kittens are loads of fun, but for a number of reasons, two kittens are better than one, in many cases.

why adopt an adult pet?

Written by Jonni Good, Yahoo! Contributor

Adult Dog vs. Puppy

If you're thinking of adopting a dog or puppy this summer, you may be planning a trip to your local animal shelter. I encourage you to consider looking at the older dogs at the pound, because there are many reasons  why an older dog can be a better pet than starting from scratch with a puppy.

Puppies are a lot of work
If you are older, the rambunctious energy of a puppy could be so overwhelming that you simply won't be able to tolerate it. (I speak from experience!) And a puppy underfoot may not be safe if you have any physical limitations. A senior dog will have many years of love left, and will enjoy sitting in front of the fire or lying quietly at your feet, and they're more patient. For an older person, a 5-year-old dog (or even older) may be a good choice.
Even if you're younger, fully-grown dogs still have much to recommend them. For instance, if an adult dog has been properly socialized in his previous environment, he will come to your home house-trained and civilized. If you have children to care for or if you work during the day, potty training a puppy could be that one extra job that you simply don't have time or patience for. Some older dogs are not housebroken, though, so this is something that you should ask about when you're picking out your dog.

Smaller dogs that were bred in puppy mills often end up in the pound because their previous owners could not get them to stop piddling on the carpet. My neighbor adopted one of these dogs, a loving, intelligent terrier, and is still struggling with the dog's poor bathroom habits after several months of patient training. (All older dogs aren't perfect - but if you take the time you can find one that is as close to perfect as a dog can get).

If you're looking for a partner to help you train for the marathon, you'll need an older dog. A puppy takes time to grow up, and your race will be over before he's old enough to help you train. A shelter dog may be the best choice as a perfect fitness partner. If you buy an older dog today, he can accompany you on your run tomorrow morning. You can't do that with a pup.

Even if you aren't an athlete, walking has been shown to be one of the best exercises for weight loss and health. Unfortunately, we don't get out and walk very much - and our waistlines show it. If you need some motivation to get out and walk, an older dog will provide this on the first day he comes home.

Older dogs may already be trained and civilized.
Many shelter dogs have already been trained to walk on a leash and come when called. In fact, you may find a dog with even more specialized training in hunting, agility, or other pursuits, even at the shelter.

My Border collie, for instance, was a master Frisbee herder with 9 years of experience in the trade before I brought her home from the Humane Society. She also knew how to sit, stay, come, roll over (but only half-way), and was willing to learn new commands when she moved into my house. The idea that old dogs can't learn new tricks is only true of those dogs who didn't have the opportunity to "learn how to learn" when they were younger. Like people, most dogs can go on learning through old age.

Even if you just want a friend or companion, an older dog may be a better choice than a puppy. If you choose the right dog, he'll meet your needs immediately, without the fuss and bother that comes with a pup.

Older dogs can offer comfort and emotional support.
Many people have found that an older dog can offer wonderful emotional support, exactly when you need it. A dog (or cat) can help you through a depressing time in your life, stand by your side while you recover from a major illness, or give you someone to care about when you need to take your mind off your own problems.

Dianne found her perfect companion in the local animal shelter. Oscar, an Airedale-wolfhound cross, gave Dianne the companionship she needed after the loss of her husband, and then happily re-adjusted when Dianne met  and married my father. A puppy could not have done the same job because Dianne works, (as most of us do), and she would not have had the time or energy for a puppy. She needed an instant friend, and a partner - Oscar was ready and willing to play that role, right from the start.

Known characteristics and temperament-
one of the best reasons to get an adult dog.

There is another very important reason for finding an older dog, rather than starting from "scratch" with a puppy, but if you aren't a professional dog handler you may not have thought of it.

As Lora Goode, an animal care technician for Multnomah County Animal Control in Oregon says in a recent interview, "With an older dog, what you see is what you get."

A cute little puppy, on the other hand, may grow into a dog that you didn't expect, and may not want - he could even become an animal that you can't afford to keep. No matter how carefully you raise a puppy, much of his behavior and temperament is "hard wired" into his genetic makeup.

Of course we want to believe that our pup will grow into a perfect dog if we just love him enough.

And we also want to believe that the snarling or cringing beast we see at the local animal shelter got that way only because someone was mean to him. Or maybe the poor dog just needs some more training. But there are "bad dogs" Even Cesar Millan has found a few aggressive, unsafe dogs that he couldn't rehabilitate. Sue Sternberg, an author, shelter owner and dog temperament expert, uses an excellent analogy in her book Successful Dog Adoption. She points out that Theodore Kaczynski was raised by loving parents and educated at Harvard before becoming the serial killer known as the Unabomber. Some people, and some dogs, are just not safe, and many people have watched their cuddly, loving puppy turn into an overly-aggressive tyrant when he hits puberty.

The temperament testing your local Humane Society does before putting a dog up for adoption will help you feel more secure about bringing a "stranger" into your home. With their help, you'll find the perfect new dog for your family, and you'll enjoy your canine friend's companionship for many years to come.