We have 2 miniature dachshunds, both (intact) males, one just turned 3 and the other 1 and a half. Historically both been completely calm, affectionate and loving dogs.
We went on holiday in October and they stayed with my in-laws. Know them well, stayed lots previously and never any issues. Whilst we were away, our older one snapped at my FIL and caught his hand. FIL said it was completely his fault, he picked him up awkwardly when he wasn't expecting it. I was slightly concerned but he was fine since and never shown any signs of aggression before so had put it to the back of my mind. On Christmas Day however he again went for my dad. This time caught his nose and burst the skin. My DH witnessed the whole thing happening, my dad had knelt down on the floor when he was asleep and tried to kiss his nose - seems like he's got a fight and snapped. Naturally there was a bit of drama around this, I was really upset and worried and still am. According to my DH my dad was completely at fault in what he done, but equally we cannot just move on as if it never happened. Since then, our dog has been quite out of sorts at times - sometimes his usually loving clingy self, other times growling at us and taking himself away to his bed alone (which is entirely unheard of). He'll still come to be picked up/cuddled sometimes and isn't showing any visible signs of injury/illness. We have a vet appointment booked tomorrow but just looking for some advice/hope in the meantime - any suggestions as to what could be up? Desperately hoping this is just something temporary which can be sorted out relatively quickly but I'm so so worried