i'll give you the pros and the cons both

Cons of having TWO:
1. You can get away with hiding one dog in a kwigy-bo and going somewhere.
2. Costs of food, shots, vets, passing illnesses back and forth, any other pet supplies doubles in cost.
3. taking two dogs by yourself anywhere can be a major challenge if they both are not perfectly behaved.
4. you always feel bad because you divide your love now, you do have special moments with each and a special bond with each, but neither really is a favorite anymore.
5. your first and at the time only love has to share you with a sibling and it's hard for them sometimes
6. if you have a dominant dog like sadie is they can be aggressive and bite/fight their sibling dog
7. twice the accidents when routines change and twice the mess, twice the paws to wipe, two coats to put on at the door each time, two harness and leashes to get ready. it's kinda tough to get them moving when you got to go somewhere
8. dog sitter and boarding is way expensive with two and it's hard to find a place to go that accepts TWO dogs staying with you.
9. two dogs to train to learn things both seperately and together
10. two crates really do fill up a car and two dogs loose from crates make a mess

Pros of having two:
1. when you come home too tired for a tug game or chase game they just amuse themselves together.
2. more warm bodies to keep your lap warm all the time.

3. double the pleasure double the fun

4. watching them snuggle up and keep each other warm
5. knowing that your pup has a lifemate that they depend on and exist with for their entire life on earth is a great happy feeling.
6.seeing them smile and run and play and knowing they are pack animals that have their "pack" mates
7. knowing that Sadie is a better dog with Bentley there. he calms her down and she brings out his playfulness. she's stopped biting and has a much more even personality since he came in. and when she does have a crazy moment then she takes it out on him and they play hard until she goes back to sleep

8. you don't feel quite as guilty leaving them home for a few hours or if you really have to putting them together in their x pen for the afternoon to go out and do something together.
9. when you loose one dog hopefully you will still have that other one to hold onto while you grieve.
10. they become a pair very fast. life before having two just doesn't seem possible. they go so well together and they make you happy and each other happy and giving a gift of a partner to your single pet is a wonderful feeling.
it takes a long time and a lot of trial and errors to find the right match but from my point of view it's worth it and we wouldn't trade Bentley for the world. he made Sadie happier and fulfilled and she makes him feel loved and accepted despite her humps and her bites

she does need him and he needs her. it's a perfect family.