#10 Salivation.

Unfortunately, constant salivation is a physiological feature of English Mastiff. Some owners use special dog collars. However, the pet should not wear a collar around the clock.
#11 They can not always get along with other pets.

Unfortunately, English Mastiff can see a potential enemy in a domestic cat, for example, by playing with it. In this case, the cat simply cannot escape punishment ...
#12 Not suitable for the role of nanny.

English Mastiffs generally treat children well. But due to its impressive size, the dog can accidentally push the child away without noticing him.