What's this spot on my dog's stomach? Is it a bacterial infection?

This looks like a mild bacterial skin infection. Dogs can get this from laying on damp ground. Often it will go away on its own. You can bathe the area with antibacterial shampoo once or twice weekly to help it heal more quickly. Since she’s not bothered by it I’m not overly concerned. Should it worsen please take her in for an exam. She may need oral antibiotics if is gets bad. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Marley.

This looks potentially like a superficial skin infection. Skin infections like this can occur secondary to allergies, fleas, or sometimes to contact with an irritating substance. I would recommend having your veterinarian take a look. They might recommend topical treatment or an oral antibiotic, or they might want to do some testing as well.

This presentation is likely to be due to a mild superficial bacterial infection (bacterial folliculitis) on the ventral abdomen. Nothing to be extremely worried about as it could be self limiting/resolving. Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid any licking/scratching (if any). If signs are not resolving, a check up, appropriate disinfection and possibly antibiotics (oral, topical or in a shampoo formulation) will be then needed to solve the problem. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!

Thanks for using Petco Pet Education Center, formerly Petcoach! This looks like a focal infection. These are called pustules and likely contain pus. You can try to use a medicated shampoo containing chlorhexidine twice weekly for 2 weeks. If there is no improvement or in the meantime this appears to be getting worse, have her evaluated by a veterinarian for further assessment and treatment. Good luck and best wishes!

This looks like a mild Staph bacterial infection of the skin. I suggest you use these medicated pads on those areas daily for about a week. If no improvement then have your vet check him out. ( https://www.allivet.com/p-5393-douxo-chlorhexidine-3-ps-pads-for-dogs-and-cats-30.aspx?SearchTerm=duoxo%20+Auto )

That looks like a skin infection - could be due to an injury. I suggest you use this product on him but you can also try Neosporin or other topical antibiotic cream. If it does not seem to be improving after 5-7 days of treatment then you should have your vet check this out. ( https://www.allivet.com/p-3356-vetasan-ointment.aspx )

This is just a small vesicle possibly a single hair follicle that got infected. Nothing to be worried about unless you notice more of those around that area. Disinfection can eventually be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid any licking (if any). Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.