Thanks everyone for the suggestions to help Jake. We've been trying them all and nothing is helping. He's going back to the vet's today for Xrays and a Lyme disease test (which isn't likely... he's had the vaccine). There's been no improvement at all and Jake is taking it like a man...
...meaning he's whiney, irritable, needy and actually quite grumpy.
At this point we don't think it's just the arthritis. The anti-inflammatory's have always helped in the past and we're not seeing them have any effect at all this time. The biggest problem is that he's so "twitchy". He can't get comfortable. He's shaking and panting constantly-even thru the night. Which isn't helping him... he's very tense and I think it's actually making him feel worse.
I'm very very tired, as he pretty much kept me up all night. It's been a long 4 days and I'm not very optimistic about it getting better any time soon.