Some of the most popular breeds in England are English Bull dogs, English Mastiffs, and Cocker/Springer Spaniels. Ooh! A Blood Hound would be AWESOME!!! There are a lot of terrier breeds, but we already have a terrier doggo, so that's out.
English Bull Dog: Some combination of Normal, Ground, or Steel type. This is just because the dog's build is so dense and strong, their bites are incredible, and they look like they can dig some epic holes. Maybe their under-bite teeth could be sticking out and be steel, thus the steel typing. It would be a good exclusive for Shield version!
English Mastiff: Fighting, Normal, or Dark (fighting being my least favorite for this particular breed, but it could work). Ground may work with this one too because of its sheer size, but I couldn't decide if Ground or Fighting would be more appropriate for the size. We just need more large and formidable doggo Pokemon with a solid defense.
Cocker/Springer/King Charles Spaniel: Grass, Fairy, Normal, or Flying. I think it would be interesting to try and make a dog a flying type, and I think these dogs would make great flying types since they move around so whimsically and free-like. Plus, their ears are so long and fluffy that it would make sense if they could fly. Plus, I don't think there are any other interesting types of doggo yet. I thought maybe grass/flying or fairy/flying would be a good type for this breed.
Blood Hound: I think a Normal/Psychic typing would be most interesting with this one. The Blood Hound is an incredible tracker, almost knowing where their prey is all the time, like an Oracle. Hence the psychic typing. Plus, it seems right to make a dog a normal type. AND! That would be a cool typing because it would eliminate so many weaknesses like Fighting and Ghost! I think it would be fantastic. If not that type, I think I'd accept any type coupled with Normal. Except dark or fire. We already have the fire one and I don't like the excessive weanesses associated with Normal/Dark.
Ya know, now that I think about it, I really just want to see another Normal/Psychic type. I loved that typing in Oranguru. I guess I'd also like to see maybe a more tank-like or wall doggo instead of a glass cannon sweeper.
Dogs are great, and I can't get enough of those Pokedoggos!