Yes...Call Animal Control to get those dogs off the street so they don't hurt other cats.Even children.
Ziggy would never have been able to defend himself without claws.He wouldn't have even been able to climb a tree.
I'm very sorry for your loss.I'm cryig with you.Rest in Peace Dear Ziggy.
Like Kim had said...No use beating yourself up over it.Just do what you can to protect others by calling Animal Control.