Guinea Pigs are born with fur. I am not sure about hamsters.
At four weeks after birth a ferret has just started developing their full covering of fur. Baby ferrets are born almost naked, the fur starts to appear in five to seven days after birth and have a good covering of fur at about four weeks.
You take them out when they are covered in fur or at 4 weeks . Then you can touch them and separate them by gender
Mice get their fur when they are just a couple of weeks old.
they have short hair at about 10 days old, but when they are big enough and have fur, they will probly be about 3 weeks (21 days)
no baby squirrels are not born with fur but when they reach 5 weeks old they should have gained all their fur
Kittens typically shed their fur for the first time when they are around 12 weeks old.
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7 weeks old because then they will be allitle big they will have fur actually they will have fur when they about 3 weeks old.
No, their teeth do not begin to grow until they are about 4 weeks of age.
I think it's when it is about 2 weeks old,or 6 weeks old.So if you have a newborn puppy and you wanna know when it grows fur and gets smarter(and stuff)all you have to do is this: 1.Check the first two weeks. 2.If he/she didn't grow fur yet,wait more. 3.Check four weeks later(If you don't get it add 4+2.4+2=6)to see if it grew fur NOW.
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About 8-12 weeks