What does it mean to say that a person is too "dog"

It means "this person is not particular and doesn't treat each other as friends". Northeast dialect.

It means that one person is very kind to another person, but when the real person has something to do, he doesn't have more help, but stands aside and watches jokes or knocks about.

the extended meaning of "dog" is extreme contempt, or refers to the loss of things or the frustration of people.

Extended information:

Features of Northeast Dialect:

1. Unbalance the tongue, change the initial r, add more initial n, and change the initial of individual words.

2. The tone value is not in place and the tone of words is inconsistent.

3. The phenomenon of vowel transformation of individual words and the addition of nasal vowel nɡ.

References: Dog (Chinese characters) _ Baidu Encyclopedia, Northeast Dialect _ Baidu Encyclopedia