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1. Afgan Hound - These dogs are considered to have a low “obedience level” among dog breeders and trainers. They are courageous, sweet and sensitive. The book also describes the Afghan Hounds as having many “cat-like” personality traits.
2. Basenjis - These dogs are most known for their unique bark and some even refer to them as barkless dogs. They also have cat-like personality traits. They are thought to be harder to train than most dogs.
3. Bulldogs - These dogs are courageous, dependable, and quite gentle. They were originally bred to guard, control and bait bulls.
4. Chow Chows -They are loyal and have a dominant nature. Their stubbornness may be mistaken for a lack of intelligence.
5. Borzois/Russian Wolfhounds -They have a free thinking and independent personality. They are not as driven to please their owners as most other dogs. This may make them harder to train. They are loyal and affectionate.
6. Bloodhounds -They can track any scent, even a scent trail that is over one hundred hours old. The Bloodhound is determined and a hard worker. Training requires a firm hand and plenty of patience.
7. Pekingeses -They are very independent and dominant which makes them difficult dogs to train. They are extremely brave and make good watchdogs.
8. Mastiffs - They can be quite stubborn at times, which some may confuse with a lack of intelligence. When training a Mastiff, try keeping the sessions short (around 10-15 minutes) but frequent (2-3 times a day.) Because Mastiffs are quite sensitive, you will have better results if you train using an excited and happy voice.
9. Beagles -They are independent which makes them a challenge to train. They are great family pets.
10. Basset Hounds -They are well known for their scenting ability and endurance when tracking. Housebreaking and training can be difficult.

For pictures, read more.

Afgan Hound
Basenjis
Bulldogs
Chow Chows
Borzois/Russian Wolfhounds
Bloodhounds
Pekingeses
Mastiffs
Beagles
Basset Hounds

Source: Alice Teoh