Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
While we can see collapse in dogs having strokes or those with heart issues, I wouldn't assume this is the case with Zoe. Instead, my major concern for her is that she could be suffering form eclampsia
or low blood calcium. This is a common issue in lactating mother dogs in the weeks after giving birth
. Small breeds seem to be very prone to this and it can be fatal if not treated. The reason we see this is because she is pouring her body's calcium reserves into her pups and their milk. And if she doesn't have enough, this leads to problems with muscle
use --which is important for her moving but also key for breathing and keeping her heart beating.
With all this in mind and with her so severely affected already, I must say that we'd want to have her seen urgently and without delay. Her local vet can test a blood sample to tell us if her calcium is in the danger zone and how much so. And as this needs urgent treatment, they can give injectable calcium. Afterwards, she can be started on oral calcium treatments (but we'd not do so here since it would be too slow to stop these signs at this point). And if her signs are severe or she has relapses despite treatment, you would need to remove the pups for hand rearing to reduce their drain on mum.
Overall, we do have a serious worry for her signs. Therefore, we would want to be proactive and help your lass quickly. So, in this situation, it would be prudent to get your wee one to the emergency vet. To find your local ER veterinary clinic, you can check HERE and @ http://www.vetlocator.com/.
Please take care,