A black Labrador from good working stock is not much bigger than a male Springer, much smaller than the golden and chocolate types you generally see as pets; great with kids, will go all day, highly biddable and amongst the most faithfull of breeds.
You'd be wrong to ignore cross-bred dogs outright. Provided you keep away from the fashionistas and the breeders who serve that market, first-cross (and first cross only) animals have a great deal going for them. They are imbued with what's called Hybrid Vigour and are almost always stronger and more robust than either of the parent breeds and shrug off the problems associated with them. Genetically, the first cross takes the best of what's provided by the parents and benefit greatl by doing so.
Traditionally, in an area like mine, folk needed hardy, intelligent and resilient dogs to put food on the table. Those dogs needed to catch rabbits for food in an area that is densely wooded and very steep and interspersed with small market gardes and forage farms. Running dogs like Greyhounds and Whippets, whilst fast enough, were too delicate for the conditions, and Collies want to herd, not hunt, but breed the two together and you get a perfect animal for the task at hand. This happened all over the place with parent breeds chosen to provide animals to suit the required purpose, and when you think about it this is precisely how we got the breeds we have today.
Two things interfere with the above, the first being the whole fashionista influence........I'll make no further comment on that; the second is when people breed these animals with each other. The results of that are unpredictable so people would always use first-cross dogs only.