Since my husband will never see this I will tell you that I have used my husband beard & mustache trimmer to shave down my babies ears!
I since have purchased a pair of clippers that I use strictly for my fur babies
. I found that If i kept their ears trimmed about half way down while they were teething their ears stayed up. This is what has worked for me, hopefully others will post and say what has worked for them so that their will be a variety of ideas.