Guinness had a leg infection that was spreading... and could have killed him had we not acted quickly.
This was January 2005. One Monday morning he came walking out of his crate on three legs. No idea why. By midday he was lethargic and by afternoon we were at the Vet. Tests were run, he got anti-inflammatories, we scheduled X-rays for the next day as that back leg was clearly causing him pain. X-rays showed nothing but he was still lethargic. By the next day (Weds.) his hock started to really swell up. By later that afternoon it had spread to his upper leg and he was still lethargic. He wouldn't eat, drink, or get up/go out to pee (we had to carry him downstairs and support his underbelly with a "sling" made from a towel, to give him some relief and let him empty his bladder). When the Vet heard of the swelling and that it was moving, she said to bring him in ASAP. More tests, blood work, etc. and still no answer but he was put on several antibiotics to try and cover everything. Also had fluid treatment as he was starting to dehydrate.
A day on antibiotics and he started perking up a bit and eating/drinking a little. But at this point it was nearly a week and still no diagnosis and not weight-bearing on that back leg. I was a basket case, sleeping (well not really - I couldn't sleep - too scared we were going to lose him!) on the hardwood floors next to his crate (and understand, he was already normally sleeping in my bed by then - but when he was ill, all he wanted was his little doggy den where he felt most safe and secure).
Friday of that week a huge, angry red bite mark shows up on his rear leg (I'll post pics in my gallery so you can see it, along with another showing how swollen his leg was). This is typical of some bug bites, the red mark doesn't show up for several days. In one pic you can almost see two puncture wounds so whatever it was that bit him, got him good.
I took digital photos to the Vet to spare Guinness another trip, and she immediately added Benadryl to his regimen. At one point he needed 13 pills a day, with two doses of one antibiotics, three doses of another, two of the anti-inflammatories, and two Benadryl pills three times a day!!! Thank goodness for peanut butter.
Adding the Benadryl to his pills sped up his recovery considerably but it was weeks before he was weight-bearing again, and a couple of months before strenuous exercise didn't result in a slight limp for a few hours thereafter.
I am assuming he encountered the bug in the basement of a friend that we had visited the Sunday before this started. She had returned from traveling abroad the night before that, and had unpacked all her suitcases/laundry, and Guinness spent a lot of time in their basement (which is part rec-room, part laundry room). It was probably a bug that isn't native to this area.
The pics should be up tomorrow if approved. This may not be as scary as some of the other stories on this post but I'll tell you, it gave me a taste of just how heart-wrenching it is when your furbaby goes through an ordeal that risks their lives. I love him so much and it was such a blessing that he got through it okay.