[SaranBear]

A week is not very long.... It's a bit much to expect 45 minutes of sustained effort on her part after only a week of CONSISTENT exercise. She may be tired and sore after all this relatively sudden exercise.

AND you stated (in another post) she is 107 lbs.... up from 89 in January... If she is almost 20lbs overweight then that is quite an extra load for a dog to carry. Even a couple pounds make a difference for a dog.

PLUS she has an eye infection that is being treated right?

So some of those things may be slowing her down. Still it's probably a great idea to bring her in if you feel like she's not herself.

Once your vet says she's good then I'd just EASE into the exercise slowly and consistently. Walk before you run...