Once cats mature, many become lactose intolerant. This makes cow's milk a
poor choice to use as a treat for your cat. Milk can cause your pet to
have stomach ailments and indigestion since they are not used to it. In
some cases milk can actually make your cat very ill and cause vomiting
Cow's milk contains much more lactase than cat's milk.
Undigested lactose leads to diarrhea. Severe diarrhea can be fatal.as
we grow up, it’s normal for people and cats to begin
producing less lactase. Less lactase means less ability to digest
lactose. The result may eventually be lactose intolerance.Though kittens
have lactase in their system, there’s just not enough of it to tackle
the lactose overload found in cow’s milk.