If you want to learn more about training and controlling your Jack Russell, my ebook is bound to save you hours of training trial and error and relieve a lot of stress from the process: The Jack Russell Lover's Ultimate Guide to Training comes complete with a full chapter on mix breeds.
Newborn baby boy
We have an 8 year old female Jack Russell Terrier who has shown unusual behaviour since our daughter brought her week old baby son home from hospital. She did lick him and has tried to lick his face several times but has also shown an interest in sniffing his nappy (whilst he is wearing it). She has also growled at him a couple of times when he has made squeaking noises due to wind and seems to get really anxious when he cries. We do not know whether we are being over cautious when we are telling her to "get down" or are we right to be concerned??? What are warning signs for aggression as sometimes she has her ears right back and other times she is wagging her tail.