Having a dog around can be very fun if you like dogs. If you don’t, well, then it’s likely not as pleasant. While sometimes this dislike is simply for no reason, there are cases where it stems from legitimate causes like allergies or fear. The worst a dog owner can do in this case is to force a person to be near their pet.
That’s exactly what the OP’s mother-in-law constantly does. To make matters worse, she justifies it by claiming it’s her emotional support animal. Interestingly, she never trained the pet for that role, which only deepened the fight with her daughter-in-law.
More info: Mumsnet