Dog is limping badly after park?

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This could well be a ruptured cruciate ligament as a dog with a luxating patella has a very unstable knee and it often leads  to too much movement in the joint and the fraying and eventual rupture of the cruciate. 

VETS for diagnoses if he isn't putting the foot down and make sure he does no jumping and running and so no walks and onlead to the garden for toiletting and that's it.   If it is what I think it could be then movement can also destroy the meniscus as well. 

Keep him really calm and see if he puts the foot down within the next few hours.  Whatever happens here his exercise must be restricted from now on. 

Then you need to call now for an appointment & take the soonest appointment available.  Only a Vet can help you now.  There are no Vets on this site & no one, not even a Vet can examine your dog online.

If he has patella luxation, diagnosed by your vet, this has nothing to do with a small dent.   What happens is if the groves that should hold the patella in place are too shallow, it will slide ouit (luxation).   Many small dogs suffer with this (you see them hitching as they walk).   Surgery will usually correct this although whether or not that is possible would depend on the age of the dog and whether he will be able to be given a general anaesthetic.    If the patella has come out and hasn't gone back in (can't) then your dog is in trouble and so I am going to say GET IT SEEN AND TREATED BY YOUR VET.

If he has no surgery slots available at the moment, then you must completely rest your dog (crate rest is best), only taking him out on a lead to empty, until your poor dog can be booked in for this corrective surgery.   Absolutely no 'running a bunch'.   I'm surprised your vet didn't discourage you from allowing that. 

Amos is right re the involvement of the ligaments.

The ONLY person who can help is the VET, so phone and get an appointment as nothing is going to change and the dog will continue to be in pain until you do

Luxation is seen in sterilized dogs and especially smaller breeds and mixes.  

Don't let him jump down from furniture or try to go down steps.  Stop him and carry him.  Rest is best, so encourage him to have lots of crate time.   

Your understanding of what the vet SAID is incorrect.  Your dog does not have this due to a "dent" in his leg bone.  Small & toy dogs who have very straight rear legs, OR who are bow-legged are often prone to luxating patellas (which are a DISLOCATED or OUT OF PLACE - knee cap).  It is allowed to move or "pop out of place" by the misaligned ligaments.

Dogs who are out of shape or at all over-weight, can also have a luxating patella.  Dogs who do not exercise the same, every day (and that might be true in the case with ALL the running your dog got on this one specific day at the dog park) would be a prime candidate for this event. - It is like an out of shape,  "weekend warrior" who does too much yard work - and then can't get out of bed the next day.

The patella has too much force placed on it when the leg bends, since the ligament is essentially attached wrong (often too much to the inside of the leg) rather than straight across the knee.  Technically, some dogs can mange to "pop it" back in place, by HYPER extending the leg - but I would not recommend you to do that.

The dog may or may not be in any pain - despite not being able to use it, since it will not swing or move correctly, once it is DISLOCATED from the correct position.  

Unfortunately, patella luxation predisposes the dog to OTHER leg injuries - like cruciate ligament injury (usually a ligament tear) which will require surgery (in most cases) to fix it.  If your vet did not TELL YOU that fact, you need to know it now, since there is no way to know if your dog has "just" patella luxation or a full or partial TEAR of the cruciate ligament = without an exam.  MY advice: complete crate rest until you see the vet or until the dog recovers (if it does) before your vet appt. time.

Thanks for the explanation, but I'll comment any way I see fit.  I'm not the one posting the problem.

Take him to the Vet.  MY dog has the same condition, and our VETERINARIAN (who "needs appointments made and isn't having time slots open every day") said NOT to let her over run OR she would eventually need surgery.  Perhaps medication can make a difference.  Perhaps it can't.  Perhaps surgery will be required.  Perhaps it won't.

So sign up for one of those time slots -

That would be hard to determine. He could just be sore or have suffered another injury. If the dog doesn't seem to be in serious pain at the moment, just wait to see what happens (pain and limp continue) and make a decision from there.

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