Dog owner here who didn't get her arm twisted - but did twist my mum's when we were young!
First of all, how old are your kids? If they are young (like not old enough to take the dog for walks by themselves or nip down to the local shop in the evening to buy dog food when you realise you've run out) then I don't recommend it. As you are the mum, you will end up doing most of the tedious day to day stuff when the kids are at school or can't be bothered. This includes walking at least once a day, feeding, training, buying food, taking to the vet, cleaning up messes - this includes when you take him out for a walk as owners nowadays are expected to clear up after their dogs have pooed. If you don't really want or like dogs, then you could grow to really resent your pet and your children for burdening you! This is horrible for everyone, especially the poor dog.
If however, your kids can be trusted to do the things I listed above most of the time, then get one. This is when we finally persuaded my mother to give in and get a dog and although she will say (truthfully) that even then, she ended up doing most of the caring for Bella (especially after we went to university, remember, dogs live to be 12-16 on average), she grew to love the dog more than any of us. She was devastated when she eventually died, as she had been a constant, affectionate and amusing presence in our home.
It is a big decision to get a dog. They are dependent on you in a way that no other per is. Please consider carefully when you make your decision. Dp and I got our current dog before we had kids and although he is very sweet and wouldn't hurt them, he is very neglected at the moment (2 year old and 2 month old). The guilt you feel is unbelievable!