I keep trying to figure out the dog's intentions. Sometimes a dog will just have fun with something, if it's not hungry. This dog looks to have a nice shiny coat and isn't very skinny. If he's not a pet, he probably lives near a fish processing station or something.
The dog has ears forward. It looks like it might be in the playful crouch, where dogs put their butt in the air and shoulders down. It may just have fun with the baby, or play with it until it squeaks enough to set off a prey instinct.
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