I am so glad the mange is better and thanks for posting the pics as they are a great help. BTW. Welcome to Beagles Unlimited and a Big Thank You for rescuing a Beagle in need of a home and providing great Vet care.
General info on treating Sarcopic Mange:
The Prolate is a good product but can not be used around the eyes , so , if the head or eye area are involved don't use.
Revolution ( Selamectin ) will treat the sarcopic mange when dosed initially by weight then followed by a second dose at 2 weeks and then once a month until resolved , usually in 3 to 4 months.
Ivermectin at therapeutic oral dose levels by weight is effective treating Sarcopic mange. ( more info if needed )
The important thing here is to stay with what is working for Ollie until resolved ( clear ) and then continue for 2 more weeks.
The use of antibiotic for secondary skin infection is needed in many cases and works well.
Steroids can be problematic with mange treatment because they interfere with the immune system and give advantage to the sarcopic mange mite.
I would reduce the steroid dose and then discontinue use. Benadryl dosed at 2mg for a 25 pound dog given twice daily has worked for me.
A medicated bath is a good idea with an oatmeal creme rinse to keep skin from drying out.
I would add 2 Tbs of yogurt to Ollie's food for yeast prevention and 1 regular strength fish oil capsule for skin and coat health.
Would you please give Ollie's current weight and the dose of Ivermectin given daily ?
Good nutrition will help speed recovery. I would use a kibble with no corn , soy or wheat. This is what I use: http://www.tractorsupply.com/4health-trade-chicken-rice-formula-for-adult-dogs-35-lb-bag-6009468
Helpful note: Sarcopic mange is contagious, so keep Ollie away from other pets in house. Clean or replace bedding. Clean crate if used , a mixture of 1oz Prolate to 1 gal water will kill the mange mite on surface areas and crate if needed. If you have a dog bed that can't be washed , place in large plastic bag with tie on bage end and leave in direct sun light all day and then keep dry for 5 days and it will be OK.
Please post any question that we can help you with , and , for sure keep us up to date on Ollie's progress.
Again , Thanks for making a great effort with health care needs and giving a good home to Ollie.
Best , oldhounddog