Dachshunds can be stubborn and difficult to train. They are also known for their excessive barking and tendency to dig.
Chihuahuas can be yappy and aggressive towards other dogs and strangers. They can also be difficult to house train.
Yorkshire Terriers can be difficult to train and can exhibit excessive barking and a tendency to nip or snap at people.
While Bichon Frises are typically friendly and affectionate, they can be prone to separation anxiety and can become destructive when left alone.
Jack Russell Terriers are known for their high energy levels and can be prone to excessive barking and destructive behaviors.
Shih Tzus can be difficult to house train and can be prone to excessive barking and separation anxiety.
Beagles are known for their loud baying and can be prone to destructive behaviors if not given enough exercise and mental stimulation.
Bulldogs can be prone to snoring and excessive drooling, which can be irritating for some owners.
Belgian Malinois are often used in law enforcement and the military and are known for their loyalty and protective instincts.
Pekingese can be stubborn and difficult to train. They are also prone to excessive barking and separation anxiety.