When your dog starts to itch their bottom, it can be a sign of something serious. There are a few things you can do to soothe your dog and help them feel better.
First, check for any fleas or ticks. If you find any, remove them immediately and treat the area with a flea and tick repellent.
Next, inspect your dog's anus for any signs of irritation or infection. If you see any redness, swelling, or discharge, take them to the vet immediately.
If there are no obvious signs of irritation or infection, you can try giving your dog a bath with an anti-itch shampoo. You can also give them an over-the-counter antihistamine if their itching is due to allergies. Be sure to talk to your vet before giving your dog any medication.