I read that pigs will "blow out" their hair a few times a year, but our old pig never did (light colored pink/white), whereas our new one - black - is losing her hair and skin is flaky. Is this normal? I'm feeding them flax seed oil and daily vitamins. Also - the new one needs her hooves trimmed, and although she loves belly rubs, forget it when i try and take something to her feet! She's about 5-6yrs old, and I doubt her old home ever trimmed her feet. Thanks for any advice!