If he doesn’t want one then you don’t get one. Having a dog is too big of a life change to not both be 100% on board.
Getting a dog WILL impact the whole household, it’s not physically possible for it not to impact him at all even if you do say you’ll do it all yourself, but do you really mean that?
You can do all the feeding & walking & vets, but it will still change and impact the whole house. The puppy howling in the night isn’t going to just keep you awake, it keeps everyone awake, when the puppy wee’s or poo’s inside (especially if carpet) that stain doesn’t just impact you, nobody can leave anything on the floor because puppy’s get it and chew it. You ALL have to do the training, that’s really important, the dog needs to be trained by all members of the house, so that’s not just you.
A dog can’t be left all day and you have primary age children, are you going to be the one who stays at home with the dog while your children go out for the day with your husband? Even if you are, your husband is then the one who is out alone with the kids, so it still impacts him, or your family time is spent differently and in a dog friendly way, so a walk in the park instead of soft play & lunch out, and that also impacts everyone.
You want to go on a family trip and it’s not dog friendly, are you going to pay for your dog to be boarded elsewhere? If you have joint finances then that’s not just you paying, it impacts family finances. Same with injury & insurance, it’s expensive.
You fancy a last min family trip to Alton Towers/the farm etc for the day, not possible, dog’s at home and can’t be left all day.
You honestly can’t compare cats to dogs, as long as you put food down for a cat you’re sorted, dogs need so so much more it’s crazy. The walking, the hours and hours of training, the destroying of furniture and flooring snd carpets, the not being able to be left, the separation anxiety that lots go through, the puppy proofing of the whole house, the having to think even about car journeys and how long the dog will be okay without a stop for a wee for, the costs of dog walker/home boarder/vets, the having to still go out and walk when it’s -1, snowing and icy or torrential raining and windy…
I have a dog, have always had dogs and I adore my dog but it is hard work and it changes your whole life, they are incredibly tying and that lasts for 12+ years. If everyone in the house isn’t 100% yes then the answer is no.