My dog has a red circular spot on her back leg and keeps chewing it.

It's possible that Feli has been licking or scratching this area, causing these abrasions. This type of lesion can develop pretty quickly - even overnight. Some of the most common causes of itching include allergies and fleas. Make sure that she's regularly receiving a good quality flea preventive (Bravecto, Nexgard, Credelio and Simparica are all great prescription options, and K9 Advantix II is available over the counter). You can also give her a bath in a gentle oatmeal or baby shampoo in case there are any lingering allergens on her coat causing irritation. You certainly don't need to rush her to a vet for these lesions alone, but if they get worse or spread, then you should take her to get checked out. When dogs scratch, they can damage the protective skin barrier, which can make them susceptible to developing skin infections. I hope that she's on the mend soon!

When a dog chews on a joint or a leg, there is usually either an itch, irritation or pain involved. If you are doing flea and tick prevention, you can pretty much rule out a flea problem. This is likely pointing to either joint pain or possibly an active mass irritating your dog. Unfortunately it is not possible to see a lot on the photo, other than that your dog has been chewing on his leg for a while. I suggest you make an appointment with your vet for an exam. He will likely want to shave the area so he can examine the skin properly and palpate the bone and other structures. depending on the findings, he may also want to do an xray to see if there is bone or joint involvement.

If Cal constantly chews on it it may be that the licking and chewing is behaviorally based rather than injury based. Having the area checked by your vet is a good option, however, to rule out any possible causes such as an underling infection or allergy. It is also a good idea to not allow Cal to continue licking and chewing on the spot and to use an Elizabethan (cone) collar until the area is completely healed. Allowing him to lick and chew on it will just prolong the healing period and the saliva may introduce a secondary infection into the area.

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be due to ringworm. This could also be just a focal skin bacterial infection or secondary to an injury that has not healed, among other possibilities. You can use an e-collar to try to prevent further self trauma. I recommend that you have Tink evaluated by your veterinarian for further assessment and treatment. They would be able to check for these possibilities and treat accordingly. Ringworm can be transmitted to humans so just in case this is what is going with Tink, wear gloves when handling this lesion. Good luck and best wishes!

The most likely cause would be a skin condition of some kind, causing her to be itchy - some common possibilities would include allergies, fleas, a bacterial or fungal skin infection, or skin mites (mange). Treatment will depend on what the cause is, so I would recommend having her examined by a vet - he/she can do a simple test called a skin scrape if needed to help diagnose the problem. In the meantime, I would suggest getting her an e-collar (plastic cone) to keep her from continuing to chew at her leg and make things worse until you can get her in to see a vet.

I would be most concerned for a lick granuloma although it is difficult to tell from pictures. These can be related to arthritic pain, boredom, compulsive disorders and allergies, among other causes. The treatment depends somewhat on what the vet suspects the cause is- but may include diet changes, pain medicine, antibiotics if it appears infected and/or behavioral modification. If your vet does not think it looks like a granuloma in person they may recommend a biopsy! I hope this helps and Mercedes is back to normal soon!

It's hard to tell, but this could be from an injury or it could be a ringworm lesion. To be safe, I think it's best to take Mia into the vet this weekend to get it diagnosed and treated. I hope this helps!