i just got home from petsmart and i bought Tekken 12 little mice that he likes to play with. so what i usually do is give him all the toys at once so he can have his way with they for awhile. so i go out to the garage to take out the trash and put some things away. so 10 mins later i walk back in the house and see that 10 of the mice have there tales eaten off. should i be worried? and i guess i'll be cutting the tales off before i give him any more of these mice.