A dog knows what is 'no'.
One hits the spot...
Logic. (If you don't like physics jokes, just keep movin') ...(if you don't like math jokes, trust me, sometimes it makes a difference).
A pure bred meth lab.
Because dogs can't whistle. (X-post from r/dadjokes)
General Knowledge
Two. But I don't know how they got in there.
It doesn't have windows.
because 7 ate 9.