Why Does My Dog Smell Like Tuna?

It could be that he got a hold of himself some tuna from somewhere. Or he has some bad breath, and if he eat a lot of soft food, then he really needs some cleaning of the teeth, and if this is near the fur, and him stinking, then you should give him a real honest scrubbing to get him clean. Hope this help, good luck to you and the pup.
Put your nose in the middle of it's hindmost and take a little wiff. If smell is strong from skin, most likely fluent oils emitted to dogs fur - that "doggy smell" - needs a hip bath!

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