I`m having a real problem with my 3 yr old Jack Russell/Rat Terrier mix Katie. For some reason she has turned very aggressive to the point of biting me. She refuses to leave her crate and if myself or my husband even looks her way, she growls and snarls at us. I literally had to dump her out of that crate to get her to go outside this morning and ended getting bit twice in the process of taking her outside and bringing her back in. I`ve had her to the vet and he found nothing physically wrong with her. I`m at my wits end with her and for the life of me can`t figure out what is wrong.
Can anyone give me some suggestions on what might be happening? If she keeps this up, I`m not going to have any choice but to get rid of her so she doesn`t bite anyone else.