THEY WILL EAT YOUR DOG! Seen it more than once. One of the best dogs I have ever known is a gator turd. Little pup got snagged in some standing water in a swamp last year wasnt but a foot or two deep. One in a gum pond ate several dogs one deer season.
The funny thing is that the gators in different river systems here act differently. In one river they arent likely to bother your dog while the next they will be on him like white on rice. We also catch a 3 legged hog or two every year out in those bad places.

Had a swimmer lose an arm last year in the lake.

If he gets your dog, just hope he stuffes him under a stump so you can get your tracking collar back.