If you're going to college soon, are you going to be able to financially support a dog. Before you answer yes, calculate out your living expenses. I know that I spend about $200 per month on necessary groceries and that pretty cheep for college living. $500 rent but if your living alone, probably more and more still for owning a pet. Probably about another $1-300 on what I'm gonna call "entertainment". I know that my credit card ran up an average of $850 a month without a dog.
I would calculate out at least $100 per month for a dog just to be on the safe side. If I were in your situation, I would need probably $1500 a month to feel secure about owning a pet. Not counting tuition for college.
If money is no issue then I would say your probably fine. College gives you plenty of time if you're not working a job.
As for big dogs, I personally wouldn't ever own a mastiff just cause they're too big for me to handle. Have you thought about going to a shelter and adopting? I thought I wanted a big dog too but I love my 34lb mutt and wouldn't trade him for anything. Also remember you'd have to spend more on food for a big dog
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I would calculate out at least $100 per month for a dog just to be on the safe side. If I were in your situation, I would need probably $1500 a month to feel secure about owning a pet. Not counting tuition for college.
If money is no issue then I would say your probably fine. College gives you plenty of time if you're not working a job.
As for big dogs, I personally wouldn't ever own a mastiff just cause they're too big for me to handle. Have you thought about going to a shelter and adopting? I thought I wanted a big dog too but I love my 34lb mutt and wouldn't trade him for anything. Also remember you'd have to spend more on food for a big dog