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Hello. Thanks for the question.
The itching may be secondary to the tick, but it's probably more likely to be due to a skin irritation from the grooming. Clipping and shampoo and perfumes can all potentially lead to an inflammatory response in the skin. It's not a bad thing, it's just the skin reacting to something foreign.
To help with the itching, you can give over the counter Benadryl. The dose in dogs is 1-2 mg per lb body weight. It can be given every 6-8 hours, as needed.
The diarrhea is likely secondary to stress. Stress colitis will usually go away on it's own over 2-3 days. To help, you can add some fiber to the diet. An easy way to do that is to give 1-2 teaspoons of canned pumpkin in his meals.
I hope this helps, let me know if you have any other questions.
No, that would be more likely from itching/ allergies.
A scab from a tick should be right at the site of the bite and fairly small.
No problem, happy to help.