We have a 12.5 year old labradoodle. She’s gone through spells over the last year or so where she collapses and shakes just a bit, then pops right back up. Over the last week or so, she is repeatedly collapsing and struggles to get back up. Is this old age related or something different? Last time we took her to the vet because of this, they said it was most likely Syncope. That was about 7 months ago but the frequency wasn’t nearly as much as it is right now.