I've had strawberries for years and found the easy way to combat all the critters is just to grow a large patch and share
I have a rabbit fence around mine, but lose many to birds and chipmunks. Look closely, if it is a bite and has teeth markes it is chipmunks. They are by far the worst...seems they will take a single bite out of a berry and move to the next ruining several.
Personally I don't like putting chemicals on my garden (that is why I grow my own food to begin with). I'd put a plate of cheap beer out to rid yourself of any slugs and observe in early morning for chipmunks. Mine are just about done and so am I...picked nearly 20 gallons this year which is my best harvest! I am sick of looking at strawberries...tired of making jam, ice-cream, and shortcakes. I've got 6 gallons in the freezer & started dehydrating them a over a week ago....have done 7 gallons fresh which made 2 gallons dried.
I leave the last couple pickings till the berries are almost over ripe and falling off....these are the best dehydrated. If you've never done it try it...great like this. Just make sure to freezer in deep freezer (below zero degrees) for a few days after you dehydrate to kill anything possibly in there (bacteria, etc).
One evenings pick with my 4 year old last week: