I have a patterdale terrier, he’s 2 years old at the end of May and he is intact(still has balls). My son is 11 months old so he is quite mobile and crawls everywhere/walks with help. When my son turned 9 months old and started crawling my dog has growled and snapped at my son and sometimes bit his fingers. I have tried calm and relaxed treats when he’s being good and saying no and sending him to his crate but that’s not helped. I recently got my son has a playpen in the living room and my dog tries to bite him through the netting. Sometimes my dog would just lick his hands and walk away and other times he’s biting at him so I’m conflicted on how to stop the aggression. My mum said to get the dog castrated but my partner (my son’s dad) said no and he’s pretty adamant about keeping the dogs balls so my mum then said to rehome the dog but we’ve had the dog since he was 8 weeks old and I don’t want to rehome him because I’m scared he’ll get rehomed to the wrong person and he doesn’t like people as it is so it would be very difficult to rehome him so I don’t want that to be an option. We live in a small house so there’s no real way of separating the dog and baby. I don’t know what to do and to top it off I’m pregnant with baby number 2 who’s due in August so we are adding another baby to the mix and the aggression towards my 11 month old it causing me stress.
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You need to talk to an animal behaviorist or dog trainer asap. One that doesn’t use force or shock collars.***
Use baby gates and separation. The dog is obviously stressed. Its also dangerous to have a biting dog. I used her: https://perkedears.com
She can do virtual calls. She’s also a mom.
I’d also look into a dog walker (friend) to give him an outlet. Take him to a sniffspot or long walks. Lots of frozen treats and activity. Ask your village. A neighbor. We make sure our dog has plenty of exercise and enrichment daily. It’s so hard but worth it to have a calm home for all. Best of luck 🤞

I second ’s advice & the one other thing I’d note is try to get him involved in activities that fulfil his breeds instinctual needs! Patterdale terrier’s are what’s know as “fell dogs” or “earth dogs” id suggest seeing if there’s any facilities that offer “barn hunt”classes! (Barn hunt is scent-based dog sport, designed for all breeds to hunt safely! They place hidden, scent-filled tubes within a straw bale maze & you let your dog go find it & it’s on you the handler to call when they’ve found the tube) (it’s a hoot)