It could be a hairball problem. Is your ferret shedding excessively? Or the brother? That could definitely be the cause.
Vaseline works great for hairballs and blockages also but is a petroleum product. It is 100% safe for your ferret to eat and they seem to really enjoy it. :)
With the laxative, give it for about a week to make sure she is hairball free.
Otherwise, ferrets tend to get lethargic when sick. I'd think a long term low level respitory infection would keep her from being bright eyed and bushy tailed.
We are thinking along the same lines about her activity level. Though we did have one little guy who had gotten a tumor and at the end was always up and about but I believe from the pain. He also lost weight rapidly which Frida hasn't done.
We are keeping her under close watch regardless.
Again thanks for your comment.
Good to hear it. Let us know how it turns out one way or another.
My favorite ferret experience is when a friend put his over-amped ferret into a round trash can. It would then run swiftly around the bottom until it actually began to defy gravity and run around the inside of the bin, circling all the way to the rim. :)
Hey Tedeschi, My 3 1/2 year old ferret Jet has the same symptoms. Some days are worse than others, but on bad days I call him "piggy" because he sounds like he is grunting. His chest crackles, and he also coughs/ snores. Otherwise he is playful, active, with a healthy appetite and beautiful coat. I'm in Canada, so I have access to a few ferret-savvy vets. I have spent hundreds of dollars getting a diagnosis. After a x-rays, the vet confirmed asthma. He recommended getting a humidifier to moisten the air. Jet also has an inhaler (like for humans). It's actually designed for cats but it works for ferrets as well. He was on Ventilin, but I find he needs something stronger, as he is still wheezy. I'm going to be paying the vet a visit in two weeks to get a prescription of something stronger --steroids or just a stronger medication. The vet also told me the asthma could also be worsened by allergies! It looks like you and I are some of the few people in the world with asthmatic ferrets! (It's not that rare - another vet told me her bunny has asthma). Hope this helps!
the comment about the asthma i was pretty sure my ferret had this as she sounded like what i sounded like before i got my inhalor but i never thought it could actually be... its reassured me a little as i just lost one of my ferrets who started of with a cough and ended up being water on the lungs
thanks know i can see what my vet can do about it