Terrier Chihuahua Mix snapping / aggressive
Please help , we have a cute 4 year old Terrier Chihuahua Mix ...We have had her 4 months now...She has always been a little snapping / aggressive....We got her fixed 6 weeks ago and every night we try and take her out to potty and go to bed.
She starts growling and snapping at us ..
before she was fixed she was a little aggressive at times...But now its every night ...what can I do ? I've been putting a towel over her and picking her up to take her out side ,I just started it 3 nights ago and its been working ...But I don't want to have to do this for ever...Its so upsetting to her and us ...Please someone help ..