Heya MountKecske,
I have had dogs all my life - both big dogs (including 3 Rottweilers) and ankle bitters.
Most of the concerns with big dog ownership can be worked around if there are sufficient finances to help with the things that an owner cannot do (or creative work-arounds).
Before I go any further, one thing I will say is that I would not recommend getting a large-breed dog without going into this knowing that adequate training and socialization is absolutely essential for big dogs. Not because they are vicious - but because they are big.
My Rottie weighs as much if not more than I do, but she, unlike me, is ~120 lbs of just about pure muscle. This is A LOT of dog. I would say this for most big dogs, but especially those in the working class - which includes St. Bernards. The working breeds are smart and learn very, very fast. My pup has also learned outside of her training just by watching me as well as my response to her actions. It is amazing to me how smart she is. Also, IME, they actually love training - to them it is not a chore/forced obedience but rather something that has been bred into their bones and they love it from what I have seen.
As much as you might want this pup, I would not recommend getting it if training and socialization are not possible and can not be consistently maintained. However, if money is available, then this might not be a problem - you can hire a trainer to teach you and your mom how to train the pup (and continue to reinforce that training as the pup grows older). You can also do online research to learn how to work with this particular breed - there is a lot of information out there that can help. If you have not trained a dog before - especially a large breed dog, I would go with a real life trainer and supplement this with online research. Also keep your mom in the loop on commands and the dog in the loop on who is boss - humans first then the dog. : )
The owner of the puppy's mother might also be able to help out/give you some ideas/suggestions on training and other information on the breed.
Other things - like walking? This can be gotten around as well - with appropriate and very good leash training, your mom should be able to walk the dog no problem. If my dog wanted to, she could lunge away from me in a heartbeat because of her power, but she doesn't. If your mom cannot walk the dog for some other reason, there are other options:
- Someone can be hired to walk the dog;
- A friend/associate of your mom's who likes to walk for exercise can take the dog with them on their walks (some really enjoy walking dogs without the other things associated with dog ownership);
- Making sure the pup has access to a fenced yard - you can put in a fence if you live with your mom or make sure finances are avialble for your mom to put one in if needed. Also, some people rent out their private back yards to people where their dog can run free. There are also electronic fences - but some debate the humanity of those.
If transportation is a problem - there are ways around this as well, but likely this would cost money if your mom does not have access to a big car to help her. Transporation is another must - the pup will need to go to the vet at a minimum.
I love puppies - but WOW they are a lot of work. If you do decide to get the pup, I would really recommend crate training (and I learned this the hard way). I was pretty opposed to crate training when I got my latest Rottie as a pup - mistake, big mistake.
If done correctly, the dogs actually learn to love the crates and it can ensure for the first couple of years that the dog (and your home) is safe when you need to go out and when you need to sleep. I really, really learned this the hard way. : )