Nine years ago my left knee went out from under neath me yet again, this time it stretched my ACL, and I was on crutches for 6 months. I ended up getting both knees replaced at the age of 36. Megan, who had several health issues, and was not a long walks kind of girl, just snuggled up next to me for the time leading up to the knee replacements and the recovery times. She never played fetch, and the only toy she liked was a toilet paper tube with the ends folded in, she was an untrained therapy dog, for me at least, and handled everything very well, but she wasn't a puppy. Gizmo, I'm sure is a little confused about why you can't do what you normally do with him, and why you have all the unusual stuff on you, but he loves you and can sense that something isn't right. Gina loves the laser pointer, only problem is she can see the light at the pointer and on the floor, so when she can't get a hold of the light on the floor she goes after the pointer it's self. Just keep loving on him, but don't risk hurting yourself any further, and he'll be ok and still give you kisses. Hope for a speedy recovery, and don't feel guilty, you did everything you could for him not to get hurt.
Cheers Quad
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RIP Megan 3/1998-5/28/2013