My dog has a sudden knot on his ear after being outside. What to do?

Thanks for using Petco Pet Education Center, formerly Petcoach! If it truly was not there yesterday, this is most likely to be a bug bite (tick, mosquito, spider, bee, other), dog/cat bite (if he was wrestling with any other friends lately), or some other random trauma (crashing through a spiky bush or catching it on something). If you're unsure how long it's been there, add cyst, benign or malignant tumor, and others to the list of possibilities. I'd slap some neosporin on there twice daily and watch it. If no improvement in 3 days (or if worsening at any time), it's time to see the vet. This goes for any accompanying facial swelling, vomiting, or diarrhea, as these could be signs of serious allergic reaction. Best of luck to you and Lucky!

Poor Rollo! A sudden onset of swelling and itching certainly sounds like an allergic reaction. Some allergic reactions do not respond to antihistamines alone and require corticosteroids. At this point, your best bet is to take Rollo to the vet (or an emergency vet if your local vet is closed) for evaluation and they will be able to prescribe steroids, if indicated. You can also try bathing Rollo in a gentle oatmeal-based dog shampoo or gentle baby shampoo in case he is having an allergic reaction to something in the environment other than a bug bite. I hope that all goes well!

It certainly sounds like this enlarged area on Bentley is infection, and I would be concerned that he has an abscess. I do not recommend popping it again yourself, as that introduces more infection into the area. He needs to see a vet for this, as he needs the area drained and cleaned sterilely, and he will need antibiotics to treat the infection. Please bring him into a vet tomorrow.

If this presentation is due to a trauma and secondary localized spot of skin infection (likely to be caused by bacteria), a check up, appropriate disinfection and antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem. Yes I would recommend to have them prescribed by your vet. 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 scratching. 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. Please find the time to give us a feedback about the consultation as that will be used to improve our service.

This may be an abscess, a cyst or a tumor. You should have it examined by your veterinarian, as it is not possible to distinguish these by just looking at a photo. An abscess can usually be treated with antibiotics and/or be lanced, and a cyst can be evacuated. To identify a tumor, your vet may want to do a fine needle aspirate (he takes some material from the bump with a needle and then looks at it under the microscope) to determine whether the mass is concerning.

It's hard to tell from the photo but if there is swelling in the ear flap it is likely a hematoma. This is a pocket of blood from a broken blood vessel inside the ear. Usually this is from shaking the head from an ear infection. While this is not an emergency it is very uncomfortable. I would recommend taking Kaiser to a vet soon to get him some relief. In the meantime, please do not give any medications over the counter until then. Good luck and kisses to Kaiser!

Thanks for using Petco Pet Education Center, formerly Petcoach! This may be due to an ear hematoma for example. This could of course be something else as it is not possible to know for sure without evaluating her. I recommend you have her evaluated by a veterinarian for further assessment and treatment. They would be able to check and treat her accordingly. Good luck!