Hi Lily - I may have missed it, but how old is Max? I had a little Yorkie who was 15’n’a’half. He’d seemed really well, apart from going nearly deaf and nearly blind, still racing around the park (had to get my old playground whistle out to get him to come back!) About 8 weeks ago, very sudden, he got very ill - Wednesday night, usual self; Thursday morning sick, didn’t want to eat; Friday - virtual collapse (I thought he’d died already.)
Rushed him to vets - they put him on a drip and ran tests, said it was his pancreas, either cancer or at best pancreatitis. Would have had to stay in for 3 or 4 days on a drip, at best would have needed daily insulin injections. Given his age, and the fact that even after 3 hours on the drip he was still out of it, we decided to let him go.
The difference with your Max may be his age, as well as his general state of health. If our little’un had been younger I might have gone for all the tests etc - he was a tough little tyke, and had the character to stand up to it all. But with some dogs, I think it’s kinder not to, even if they’re younger - our Affie may have needed a heart pace-maker, but we decided against it as he would have been terribly distressed by having to go off to a strange place for a couple of days. He’s doing fine on just medication, though he may not live quite so long.
I think you have to try to get a balance between the invasiveness of the tests, versus the possible benefits. If there’s a way to go whereby you can treat them fairly safely for the most likely scenario, and wait and see, I’d tend to go for that. One problem is that it can be hard to tell if they’re in pain, as they tend to be so stoical - best clue is if they’re eating OK.
Whatever, the best of luck with it. I still miss our little’un dreadfully - we’ll be out in the park with the Affie and I’m automatically looking round for him, still brings tears to my eyes when I remember he’s gone. But it’s the price you pay for all the love they give you. I read this wonderful thing, that every time a dog leaves you he takes a peice of your heart, and every time a new dog comes to you he gives you a peice of his heart, until in the end your heart is all dog.