This is not healthy. It's a simple case of 'Matorus-Discomfert' or in a simpler term, 'Circulation Cutoff', your domestic rat has a rare case of it and about 1of 10 rats get it every year.
To cure it you can see a animal vet and they will give you free treatment for 2 weeks, which will get rid of the symptom and it will never come back.
You cannot buy the treatment anywhere else but also, that may work, is giving your rat a warm (not cold or hot) bath in a shallow container but make sure you have shallow water, be sure not to drown it and watch it at all times. Rats are pretty tame in water so once this is done you may see good results.
No. All pet rats are vaccinated.
You can find pet rats in a lot of pet stores, or animal rescues. You can find wild rats just about anywhere.
its not all pet rats its just the ones that are black and white because it looks somewhat like a tuxedo
Yes
No, they can sometimes prevent them!
Pet rats are not vermin. Pet rats are raised in a pet store, laboratory, or adoption center and they are raised to be pets or in the case of labs, experiments. if you are thinking of buying a rat remember not to buy a rat raised as food for snakes. Rats bred to be pets are much gentler and sweeter than rats raised as food.
no
for a pet, or for their predators
no
Pet rats don't have to be cleaned. They are fanatic groomers, and take care of it themselves. -Rat girl <3
No
Rats pretty much like to be pat anywhere,