
I have had a dog in this house since I was a baby (I am 23 now). Started off with a Doberman named Cuda, he was a good dog, totally blasted any stereotype for the breed. He was a 90 pound lap dog in his eyes.
Then we got Joy. Joy came into the house when my sister and I were 8 years old. I think Joy really helped my sister, who was visually impared, and had some learning disabilities. Joy was patient with her, since my sister would get hyper, and then bump her on the way through the hallways (sorry Joy!). She also was a companion to us, and we looked forward to Joy either meeting us at the door after school, or being at the school out for her daily walk. I think dogs, and animals can do a lot for people. I know my sister benefited greatly from Joy being around. My sister settled down, learned to groom Joy (although grooming meant brushing and thats all for my sister). It taught her to take care of something.
That being said, mom knew she was the one with SOLE responsibility for Joy. Mom was the one that trained her, worked her, socialized her, etc. Mom was the one paying for vets appointments, food, and other incidentals needed for her. My mom was also a single mother of TWINS, one being the above mentioned girl, and the other me. It did take a lot to raise Joy, but it became a team effort with certain things. Picking up in the yard, feeding her her breaky and supper, brushing her, it was shared by all. I think Joy was the one that taught me responsibility. But in the end, it came down to the fact that when mom brought the 8 week old sporting dog home, she knew what she was getting into.
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I personally, look at the circumstances. Coming from the family I have, I know the benefits of having a dog with a person with disabilities, although a lot of people wont think twice about selling a pup to a person that has a learning disabled, or otherwise disabled child. I am not saying that I wouldnt tell them it wasnt suitable for them at the moment, when interviewing or chatting with them, but I wouldnt take them off the list before I even met the family.
Some people wont sell to single mothers either (have noticed that, not on this forum, but in life in general). Again, situations are different.
The breed I have now, tends not to be patient. So I would be more "hard" for lack of better words, trying to make sure these people have done the research, know what is expected, etc before selling a pup. The only time I say outright NO, to a person with a child, is when the baby is a right newborn. To much stress, so it isnt good for a pup.
I make a lot more decisions based on what people say to me, then a persons age. I have had more people come to me asking for a "Miniature Doberman". Right off the bat, no, you are not getting a pup. Things like that.
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Growing up with dogs, I dont know what I would do if I never had the opportunity to learn how to take care of a dog when I was younger. I dont know what I would do if I didnt grow up with Joy.
Long post, but thats my opinion.