Please don't get a pug.
They're a really sad breed, and they can often suffer extensively with respiratory problems and overheating.
They've cruelly been selectively bred over the past few decades to be shorter and stockier, and to have shorter and shorter snouts. The short snouts make it very difficult for them to breathe naturally, hence why a lot of pugs have a common snorting sound when breathing.
And having been bred to be short and stocky, they use up a lot of energy fast, so they have to cool down quite well, which is difficult with their short snout, as their only way of cooling down is by breathing.
And finally, a lot of owners while not meaning to mistreat their animals, will overfeed them and they can get fat quickly, which really just exacerbates all their issues.
For the same reasons I would also say that you please don't get a British Bulldog, since they have the same issue of having their snout bred out of them.
And also be aware of the unique issues of other breeds too.
King Charles Spaniels are prone to issues with their eyes, on account of them bulging.
As are Basset Hounds.
roosterer Spaniels (and their mixbreed offspring) have delicate ears, also prone to infection.
Dogs like Collies, including Labradors and Golden Retrievers, need more exercise than smaller dogs, since they're all work dogs, and their mentality makes them want to exercise. They can get quite depressive at times if they don't get all the exercise they want.
Please research any dog breed you get before you do, so that you know fully well what issues there are with them, how to look after them, and what sort of injuries you may expect down the line.
It would be unfair if you took on a dog that is known for getting infections, and you couldn't afford the vet bills when it happens, and so put them down.
And finally, don't neglect a mongrel. They can be the loveliest dogs going too, and you know you're normally a bit safer with mongrels than with pedigrees, since they're further from the inbreeding that goes on a lot in that dog breeding culture.