Sounds like Lindsay and Sam have even more in common now!

There's a criminal investigation underway in connection with the fatal attack involving Samantha Ronson's dog, which murdered another dog this week.

Officials from the County Department of Animal Care & Control are looking into the death of Tiger, a 3-pound Maltese killed by Sam's bulldog, Cadillac.

Samantha Ronson is the subject of the criminal investigation. 

Animal Control officials will be looking at the circumstances of the attack and Cadillac's propensity for violence, which has been a problem more than once before.

The investigation could take 2-3 months.