Can You Help Me Narrow Down What Small Breed Of Dog To Get?

I have 4 horses, 2 other dogs (a almost 2yr old Papillon, & a 8yr old Sheltie), & 4 cats (2 inside; 2 outside). All my pets get along with dogs.needs to be a g It ood traveler, and put up with being taken places including horse shows. I’d like it to be fairly small under 20 lbs but the smaller probably the better. No fenced in yard, but I do have about 6 acres. I have raised a litter of Shelties which are the easiest to train and also trained my Papillon with a short attention span! Also please dont say depends on the dog, I know that.
I was considering these breeds-
Affenpinscher
Cairn Terrier (but r they ok w/ cats? I heard not)
Coton de Tulear
Italian Greyhound
Miniture Pinscher
Norfolk Terrier
Norwich Terrier
Silky Terrier aka Australian Silky Terrier
Toy Fox Terrier
Rat Terrier (the smaller type)
Toy American Eskimo
& Podengo Portugueso Pequeno or Portuguesse Hound, but these are pretty rare
I would also luv to hear about other breeds too!

My Greyhound Hates Small Animals?

I have the sweetest and most gentle greyhound ever. But when he sees a small dog or any small animal he goes NUTS and turns into a ferocious and vicious dog. He even bit me one time because I was trying to pull him away from this other small dog. Does anyone know the best way to train him without taking him to a dog trainer? It’s to the point where I can’t even take him to get him groomed because he grabbed a cat once while they were taking him back to get washed. Thank God the cat’s ok. It clawed his face pretty good though. Any suggestions?

Medium Size Sporty Dog Breeds That Would Suit A Small House?

I’m a long way away from getting a dog but I’m thinking about it in the future. I’m moving to a flat (apartment), it is two level but still pretty small. I’m not really keen on small foo foo dogs or terriers, other half doesnt like greyhound-type dogs or lab/golden retrievers. Have lived with springer and cocker spaniels all my life, adore them but would like to try a different breed if possible. Cross breeds are fine too, I plan to check out the local shelters. Basically I would like a dog thats up to medium size, easy to train, that I can do agility with and exercise 1 and a half to 2 hours a day. I love collies, but dont think its really fair to keep them in a flat. Also like Duck Tollers, but not sure if they would settle in a flat…basically I need a dog that, although it is active, will be reasonably calm around the house, and not bark loads (afraid of annoying neighbours).
I’m very demanding aren’t I?