While dog sitting and constantly asking questions here because I don’t want anything to go wrong while the dogs are in my care.  I noticed tonight some unusual scratches or marks I’ll include a picture
Thank you for sharing the details and the picture. The redness and scratch-like marks in your dog's groin and anal area could be due to several factors, including: Please understand that the exact cause can only be determined by inspection.
Firstly, allergies are a common cause. Dogs can develop allergies to various things such as food, environmental factors, or even certain materials, leading to itching and redness.
Secondly, parasites like fleas, ticks, and mites can cause significant irritation and scratching. Even if your dog is not currently on flea and tick prevention, it's worth checking for these pests.
Infections, whether bacterial or fungal, can also cause redness and irritation and often require medical treatment.
Contact dermatitis is another possibility. This can occur if your dog has come into contact with an irritant, such as certain plants, chemicals, or cleaning products.
Lastly, self-trauma can be a factor. Dogs sometimes scratch or bite at an area due to discomfort, which can lead to redness and marks.
For home care, you can try the following steps:
Firstly, keep the area clean and dry. Gently clean the affected area with a mild antiseptic solution or saline solution.
Secondly, prevent further irritation. Ensure your dog is not licking or scratching the area excessively. You might need to use an Elizabethan collar (cone) to prevent this.
If you have any further questions, please feel free to ask. Thank you.