dogs have not two tails . vs dogs do have not two tails .

Some examples from the web:

• Pleased as a puppy with two tails.
• Happy as a pup with two tails.
• They got two tails and a drill bit for a head.
• He's got two tails on his surveillance team about five feet behind him.
• All hauled vehicles shall have two tail lamp brackets at each end
• Those dogs have a sixth sense.
• Maybe double concave with a swallow tail.
• - Carrington is not vβntului tail.
• A snake eating his own tail.
• Ouroboros... the snake devouring its tail.
• Heard their fries are just rat tails.
• Power converter got crushed by a slasher tail.
• Get your two tails off my back, will you?
• Those dogs have a nice life.
• A lot of these dogs have rescued people from burning buildings.
• Studies have shown that children who grow up with dogs have stronger immune systems.
• All dogs have is their instincts.
• Studies to determine the effect of orbifloxacin on fertility in dogs have not been conducted.
• The dogs have to travel in cages.
• Dogs have an intuition for these things.

Some examples from the web:

• Pleased as a puppy with two tails.
• Happy as a pup with two tails.
• They got two tails and a drill bit for a head.
• He's got two tails on his surveillance team about five feet behind him.
• All hauled vehicles shall have two tail lamp brackets at each end
• Maybe double concave with a swallow tail.
• - Carrington is not vβntului tail.
• A snake eating his own tail.
• Ouroboros... the snake devouring its tail.
• Heard their fries are just rat tails.
• Power converter got crushed by a slasher tail.
• Get your two tails off my back, will you?
• This dog don't bark that way.
• Liz, dogs do not have civil rights.
• This dog don't bark that way.
• Dogs don't have a conscience.
• But you know, trained dogs don't bark in alarm.
• And the dogs do love a run out.
• Dogs don't usually roam around neighborhoods... unless they're with people.
• Your infidel dogs don't want to fight.