I'm sorry if this sounds like a jumble, am still feeling very upset.
We have a 10 month old collie cross who we've had since he was a very young puppy. He's a lovely, affectionate dog, although we have been back and forth to a private trainer due to issues with walks (pulling and yanking -- and is so strong that only DH can now walk him as he would genuinely pull me over) which are still unresolved. Indoors he is generally very chilled, to the point of being quite lazy, and has until the last month or so had a very good relationship with our four year old.
I've noticed a shift, not in his general behaviour but in his patience with her over the last few weeks. Obviously I supervise and step in immediately if I feel my daughter is invading his space or annoying him in any way and I stop her immediately if she tries to wake him up when he is sleeping. But earlier on today I sat down for a coffee while daughter was watching cartoons; dog was dosing next to the sofa and daughter just cuddled into him while watching telly as she often does. He has never seemed to mind this in the past, but today he suddenly snapped at her cheek.
It wasn't a proper bite, and hasn't left a mark, although it hurt her and she was very upset. It seemed like a warning, but I'm so upset that it has happened and am now worried that if he will give a nip without even a growl of warning, he is quite capable of properly biting in the same manner. As mentioned above, I do closely supervise and always intervene / discipline daughter if she does anything I can see the dog is finding annoying and we discourage mouthy puppy play, but at the same time she is only 4 and there will I'm sure be moments in the future where she forgets herself. As this happened right in front of me and without warning I am worried that it doesn't make a difference whether or not she is supervised.
Has anybody experienced this before? I've spent the afternoon feeling like he is some stranger's dog and have kept them apart, am feeling quite tearful. Would it be worth going back to a trainer or should we be considering if we are the right family for him?
Please be gentle, I cannot believe I have even written about rehoming, as he is very much a member of the family. I feel a little bit in shock to be honest.